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Journal of General Internal Medicine logoLink to Journal of General Internal Medicine
. 2005 Dec;20(12):1102–1107. doi: 10.1111/j.1525-1497.2005.00240.x

Chlamydia Screening and Management Practices of Primary Care Physicians and Nurse Practitioners in California

Sarah L Guerry 1,2, Heidi M Bauer 1, Laura Packel 1, Michael Samuel 1, Joan Chow 1, Miriam Rhew 3, Gail Bolan 1
PMCID: PMC1490271  PMID: 16423098

Abstract

BACKGROUND

Because sexually transmitted chlamydial infections are common among young women, it is critical that providers screen and manage these infections appropriately.

OBJECTIVE

To assess the Chlamydia care practices of California primary care physicians and nurse practitioners.

DESIGN

Cross-sectional, self-report mail survey.

PARTICIPANTS

A stratified random sample of primary care physicians and a convenience sample of primary care nurse practitioners in California.

MEASUREMENTS AND MAIN RESULTS

Survey content included 5 topic areas: sexual history taking, management of cervicitis, management of a nonpregnant Chlamydia-infected patient, availability of onsite STD services, and Chlamydia screening practices and attitudes. Main outcome measure was the reported frequency of Chlamydia screening of sexually active women age 25 and younger. Respondents included 708 physicians (49% response rate) and 895 nurse practitioners (63% response rate). Nearly half of physicians (47%, 95% confidence interval [CI], 42% to 51%) and a majority of nurse practitioners (79%, 95% CI, 77% to 82%) reported routine Chlamydia screening of women under age 20; similar proportions reported routinely screening women aged 20 to 25 years. Independent predictors of screening among physicians were adolescent medicine specialty, female gender, practicing in a nonprivate setting, and having a higher volume of female patients. Additional findings included the overscreening of women over age 25 by nurse practitioners and the shared concern among providers that Chlamydia screening may not be reimbursed.

CONCLUSIONS

The Chlamydia care practices of many California primary care providers are inconsistent with current guidelines. Targeted provider education and improved reimbursements are potential strategies for improvement.

Keywords: STD care, sexual health, physician decision-making, Chlamydia trachomatis, nurse practitioners


Chlamydia trachomatis has been called the “silent epidemic” of reproductive age women and is the most common sexually transmitted bacterial infection in the United States.1 The majority of chlamydial infections in women are asymptomatic and, untreated may cause pelvic inflammatory disease (PID) and its sequelae: ectopic pregnancy, infertility, and chronic pelvic pain.2,3 There is solid evidence that routine screening of young sexually active women prevents PID and reduces the prevalence of infection in the community.4,5 The U.S. Preventive Services Task Force and the Centers for Disease Control and Prevention recommend that sexually active females aged 25 or younger be routinely screened for Chlamydia.1,6

Despite national guidelines, surveys have consistently demonstrated incomplete Chlamydia screening as well as inadequate risk assessment and education. A national survey in 1999 found that less than one-third of primary care providers reported routine screening of nonpregnant females for Chlamydia.7 Recent national estimates indicate that less than half of young sexually active women are receiving routine Chlamydia screening in managed care.8 Studies indicate that adolescents and adults are not routinely receiving sexual risk assessments.914 Although national data confirm the widespread use of appropriate treatment regimens,15 only about two-thirds of adolescents receive sexually transmitted disease education and counseling.10,12

California has had numerous initiatives to improve STD screening and care. In 1998, the California Chlamydia Action Coalition initiated a multilevel campaign to develop policy and structural interventions to decrease Chlamydia infections in California. Several of these activities, including updated and expanded clinical guidelines and provider education incentives, were targeted to primary care providers, with an emphasis in managed care organizations.16 California's Family Planning Access Care Treatment (Family PACT) Program established reimbursement mechanisms to ensure appropriate diagnostic testing (including urine-based technology) and treatment of sexually transmitted diseases for women 200% or below the federal poverty level.17,18

With scientific evidence for clinical and public health benefits of Chlamydia screening and clear consistent clinical guidelines, it is important to assess the knowledge, attitudes, and practices of health care providers that care for the population with the highest rate of chlamydial infection: young sexually active women. This survey focused on the Chlamydia-related clinical practices of primary care physicians and nurse practitioners in California in 2002 to identify ongoing policy and training needs.

METHODS

Sampling

A random sample of 2000 California primary care physicians was obtained from the American Medical Association (AMA) Physician Masterfile, which included members and nonmembers of the AMA (Medical Marketing Service Inc, Wood Dale, IL). The sample was stratified equally among five primary care specialties: family practice, general practice, internal medicine, obstetrics and gynecology, and pediatrics. In addition, all 68 adolescent medicine providers registered in the AMA database were included in the sample. All 1,815 primary care nurse practitioner members of the California Coalition of Nurse Practitioners were surveyed. Sample sizes were chosen to provide sufficient power (80%) to detect a 15% difference in Chlamydia screening rates between physician specialties, given an estimated 60% response rate. Eligibility criteria included practicing in California and providing primary health care to sexually active patients under the age of 30 in the past 3 months. Providers were ineligible if less than 10% of their time was spent providing clinical care or they lacked a valid California telephone number or mailing address.

The questionnaire was mailed to the physician and nurse practitioner samples in December 2001 and March 2002, respectively. All providers received a coupon for a free course given by the California STD/HIV Prevention Training Center. Half of physicians were randomized to receive a $5 cash incentive mailed with the questionnaire. Two follow-up mailings were sent to physician nonrespondents in February and May 2002 and to nurse practitioner nonrespondents in May and August 2002. Physician nonrespondents were contacted by phone to encourage participation and to confirm fax numbers. In August 2002, all nonrespondent physicians were faxed or sent a fourth mailing. Remaining nonrespondents with available fax numbers were faxed surveys in November 2002.

Data Collection

A self-administered survey about STD practices was developed and pilot tested. Survey topics were chosen based on current guidelines for the screening, diagnosis, and management of chlamydial infections. Data on demographics were collected from the AMA file for physicians and included in the survey for nurse practitioners. Additional practice characteristics included specialty type, primary practice setting, and average number of young female patients (15 to 25 years of age) seen per week.

Survey content was divided into 5 topic areas: (1) sexual history taking, (2) evaluation of a young sexually active patient with signs of symptoms suggestive of urethritis or cervicitis, (3) management of a nonpregnant patient with a positive Chlamydia test, (4) availability of STD testing and prevention resources on site, and (5) Chlamydia screening practices and attitudes. For questions related to the frequency of specific clinical practices, providers were given a 5-point scale (never, sometimes, half of the time, usually, always). For questions related to attitudes, providers were given a series of statements and asked to respond on a 5-point scale (strongly disagree, disagree, neutral, agree, strongly agree).

Sexual history taking was assessed in three clinical situations: a routine new patient visit, a routine well care or annual visit, and an acute care visit for any reason other than STDs. Providers were asked, “How often do you take a sexual history from a young adult (15 to 25 years of age) in each of the following situations?” Specific topics that were generally included in the sexual history were assessed. Chlamydia screening practices were assessed by the following question, “When you provide care for sexually active females at an annual well-care visit without signs or symptoms of an STD in the following age groups, how often do you test for Chlamydia?” Possible responses were given for each of 3 age groups, less than 20, 20 to 25, and 26 to 34 years. Additionally, providers were asked under what circumstances they test asymptomatic women over the age of 25.

Data Analysis

Routine practice was defined as a response of “usually” or “always” to a particular clinical practice question. These variables were dichotomized (never/sometimes/half vs usually/always) for statistical comparison. Similarly, responses to attitude statements were dichotomized (strongly disagree/disagree/neutral vs agree/strongly agree) for statistical comparison. The data were analyzed using SAS and STATA statistical software.19,20 Because there was no significant difference in demographics or practice patterns between physicians who received the financial incentive and those who did not, physician samples were combined for final analysis. To generate population estimates, weights were constructed based on the inverse of the sampling fraction of each medical specialty in the AMA database. With the exception of the description of the sample, all analyses used weighted estimates. Because of differences in sampling strategy, comparisons between physician and nurse practitioner samples were not subjected to statistical testing.

For 2 × 2 cross-tabulation, Yates corrected χ2statistic was used. For crosstabulations with greater than 2 categories of variables, statistical associations were determined using the Pearson χ2statistic. Statistical significance was defined as P <.05. Odds ratio estimates and 95% confidence intervals were used to summarize bivariate associations. Multivariate logistic regression was used to determine independent predictors of routine Chlamydia screening of women aged 25 or younger among physicians and nurse practitioners. The outcome variable for the models combined the providers' responses to screening frequency for women under age 20 and 20 to 25 years. A multivariate model was constructed to predict providers that could be targeted for interventions and education. In construction of the model, all demographic variables were tested for significant association with routine screening. Those that were significantly associated with screening at P <.05 in the univariate analysis, were included in the model, with the exception of years since completing residency, which was found to be collinear with age. Other tests for collinearity of independent variables in both the physician and nurse models were run and no significant collinearity between these variables was noted. All 2-way interaction terms were tested. While there was suggestion of an interaction between physician specialty and practice setting in multivariate analysis and stratified tables, the model that included this term was unstable because of cells with zero observations.

RESULTS

Of the 2,068 physicians sampled, 1,456 were determined to be eligible for the study and 708 completed the survey (response rate of 49%). Adolescent medicine specialists were more likely to complete the survey compared with other specialties (82% vs 47%, P <.001). Internal medicine and general practice providers had the lowest response rate (42%). There were no significant differences between the demographic characteristics of respondent and nonrespondent physicians. Of the 1,815 nurse practitioners surveyed, 1,418 were determined eligible and 895 (63%) completed the survey. Demographic data for nonrespondent nurse practitioners were unavailable for comparison to respondents. Selected characteristics of the study groups are presented in Table 1)

Table 1.

Characteristics of the California Primary Care Providers Included in the Survey Sample

Demographics Physicians (N=708)N*(%) Nurse Practitioners (N=895)N*(%)
Age
 Less than 45 264 (37) 372 (42)
 45 to 55 226 (32) 401 (45)
 Over 55 218 (31) 122 (14)
Gender
 Male 470 (66) 39 (4)
 Female 238 (34) 851 (95)
Specialty
 Family Practice 174 (25)
 General Practice 90 (13)
 Internal Medicine 113 (16)
 Pediatrics 125 (18)
 Obstetrics and Gynecology 164 (23)
 Adolescent Medicine 42 (6)
Number of years in practice
 Less than 10 229 (34) 565 (65)
 11 to 20 188 (28) 189 (22)
 Over 20 256 (38) 115 (13)
Practice setting
 Private practice 444 (63) 344 (39)
 Public clinic 71 (10) 259 (29)
 Health maintenance organization (HMO) 113 (16) 123 (14)
 Academic 50 (7) 78 (9)
 Other 23 (3) 85 (10)
Average number of female patients ages 15 to 25 per wk
 Less than 11 291 (42) 240 (27)
 11 to 20 168 (24) 264 (30)
 More than 20 238 (34) 381 (43)
*

Numbers may not total final N because of missing data.

Sexual Risk Assessment

Providers were more likely to report taking a sexual history from young adults (15 to 25 years old) at routine annual or new patient visits compared with acute care, non-STD related visits (Table 2) The proportions of physicians who reported taking a sexual history at routine annual visits varied significantly by specialty: adolescent medicine providers (95%), obstetrician-gynecologists (85%), pediatricians (85%), family practitioners (69%), internists (67%), and general practitioners (66%) (P <.001).

Table 2.

Chlamydia Assessment & Screening Practices and Screening Attitudes Reported by California Primary Care Providers

Physicians (N=708) %*(95% CI) Nurse Practitioners (N=895) % (95% CI)
Assessment & Screening
Routine sexual history taking
 Annual visit 73.3 (69.4 to 77.3) 92.2 (90.5 to 94.0)
 New patient 65.7 (61.6 to 69.9) 77.2 (74.5 to 80.0)
 Acute care 20.6 (17.3 to 23.8) 29.0 (26.0 to 32.0)
Routine Chlamydia screening
 Females less than 20 46.6 (42.2 to 51.0) 79.3 (76.5 to 82.0)
 Females age 20 to 25 47.0 (42.3 to 51.8) 77.9 (75.1 to 80.7)
 Females age 26 to 34 31.6 (27.1 to 36.0) 50.3 (46.9 to 53.7)
Screening Attitudes (% AGREE)
 Test may not get paid for 34.8 (30.6 to 39.2) 22.4 (19.6 to 25.1)
Chlamydia prevalence is low in population 18.6 (15.1 to 22.2) 9.9 (7.9 to 11.8)
 Routine screening does not result in significant savings 9.9 (7.3 to 12.4) 6.9 (5.2 to 8.6)
 Routine screening is time consuming 10.5 (7.6 to 13.5) 3.2 (2.0 to 4.4)
 Routine screening involves awkward subject matter to discuss 13.0 (9.8 to 16.2) 2.6 (1.6 to 3.7)
*

Weighted for physician specialty.

Routine defined as response of usually/always.

CI, confidence interval.

Over 80% of physicians and nurse practitioners reported routinely asking about the following topics in their sexual risk assessments: the use of condoms or other barrier methods, the use of or need for contraception, and recent sexual activity. Over half (55% of physicians and 72% of nurse practitioners) reported asking about number of sex partners. Slightly fewer (55% of physicians and 62% of nurse practitioners) reported asking about gender of sex partners. In addition, only 30% of physicians and 37% of nurse practitioners reported routinely asking about patient sexual practices (i.e., oral, vaginal, anal intercourse).

Chlamydia Screening

Nearly half of physicians and the majority of nurse practitioners reported routinely screening women age 25 or younger (Table 2). Among physicians, factors independently associated with routinely screening women age 25 or younger included adolescent medicine specialty (compared with internal medicine), female gender, practicing at either a public, a freestanding Health Maintenance Organization (HMO) or “other” setting (compared with private setting), and higher volume of female patients (compared with lowest volume of female patients) (Table 3) Among nurse practitioners, independent predictors of routine Chlamydia screening included practicing in a public, HMO, or “other” setting, younger age, and higher patient volume (Table 4)

Table 3.

Factors Independently Associated with Screening Women 25 and Younger for Chlamydia Among California Primary Care Physicians, N=708

Characteristic Weighted % Adjusted OR *(95% CI)
Specialty
 Internal Medicine 40.0 Referent
 Obstetrics Gynecology 51.2 1.36 (0.75 to 2.47)
 Adolescent Medicine 88.1 5.04 (1.64 to 15.51)
 Family Practice 41.7 1.07 (0.62 to 1.86)
 General Practice 49.4 1.76 (0.90 to 3.43)
 Pediatrics 50.9 1.21 (0.68 to 2.14)
Gender
 Male 37.9 Referent
 Female 58.5 1.84 (1.18 to 2.86)
Practice setting
 Private 36.3 Referent
 HMO 54.1 1.97 (1.18 to 3.27)
 Public 69.3 3.98 (1.98 to 8.01)
 Other 65.5 3.21 (1.60 to 6.44)
Female patients per week
 Less than 11 36.5 Referent
 11 to 20 52.1 1.93 (1.21 to 3.06)
 More than 20 52.7 1.64 (0.98 to 2.75)
*

Adjusted for specialty, gender, practice setting, age, and female patients per week.

Freestanding Health Maintenance Organization (HMO).

Other practice settings included academic and other unspecified.

CI, confidence interval; OR, odds ratio.

Table 4.

Factors Independently Associated with Screening Women 25 and Younger for Chlamydia Among California Nurse Practitioners, N=895

Characteristic % Adjusted OR *(95% CI)
Practice setting
 Private 63.8 Referent
 HMO 81.6 2.28 (1.34 to 3.88)
 Public 89.9 4.70 (2.90 to 7.61)
 Other 79.8 2.15 (1.35 to 3.43)
Age
 Less than 45 80.5 2.34 (1.42 to 3.85)
 45 to 55 76.4 1.74 (1.07 to 2.81)
 Greater than 55 66.7 Referent
Female patients per week
 Less than 11 63.0 Referent
 11 to 20 78.6 1.96 (1.30 to 2.97)
 More than 20 84.5 2.86 (1.91 to 4.27)
*

Adjusted for gender, practice setting, age and female patients per week.

Freestanding Health Maintenance Organization.

Other practice settings include academic and other unspecified.

CI, confidence interval; OR, odds ratio.

Although not currently recommended, reported routine screening of asymptomatic women over the age of 25 was common (Table 2). The most frequently reported reasons for screening older women included the patient's request for a STD check-up (physicians 80% and nurse practitioners 93%), multiple sex partners (physicians 66% and nurse practitioners 83%), previous STD (physicians 56% and nurse practitioners 62%), or indication that partner may have other partners (physicians 56% and nurse practitioners 75%). In addition, the majority of nurse practitioners reported screening older women if they were not using barrier methods consistently (71%) or if they were starting a new relationship (61%).

A common concern among both physicians and nurse practitioners was that Chlamydia tests would not be paid for (Table 2). Agreement with statements regarding lack of reimbursement or low prevalence of Chlamydia was significantly associated with lower reported Chlamydia screening rates.

Chlamydia Management Practices and Clinic Services

Presented with a scenario of a nonpregnant patient with a positive Chlamydia test, the majority of providers reported routinely treating patients, providing risk-reduction counseling, advising patients to inform partners, and reporting the case to the health department (Table 5) Patient delivered partner therapy for both male and female partners was reportedly provided by nearly half of both physicians and nurse practitioners.

Table 5.

Clinical Management and Clinic Services Reported by California Primary Care Providers

Physicians N=708 % (95% CI) Nurse Practitioners N=895 %*(95% CI)
Clinical Management
For patients with cervicitis, routinely
 Order Chlamydia test 88.1 (85.3 to 91.0) 94.4 (92.8 to 95.9)
 Order gonorrhea test 87.8 (84.8 to 90.7) 95.2 (93.8 to 96.6)
 Treat presumptively for Chlamydia 60.2 (55.7 to 64.6) 64.0 (60.7 to 67.2)
 Treat presumptively for gonorrhea 54.4 (49.8 to 58.9) 51.8 (48.3 to 55.2)
For Chlamydia-infected patients, routinely
 Call patient and call in prescription 81.9 (78.6 to 85.2) 67.9 (64.7 to 71.0)
 Request return for observed treatment 34.9 (30.6 to 39.2) 38.6 (35.3 to 41.9)
 Follow-up to confirm treatment 44.5 (40.1 to 49.0) 47.2 (43.8 to 50.6)
 Provide risk-reduction counseling 73.9 (69.8 to 78.0) 92.5 (90.7 to 94.3)
 Advise abstinence for 7 d 73.7 (69.7 to 77.7) 84.8 (82.4 to 87.2)
 Advise patient to inform partners 95.8 (93.9 to 97.7) 97.5 (96.4 to 98.5)
 Provide medicine for male partner 45.6 (41.2 to 50.0) 47.1 (43.7 to 50.4)
 Provide medicine for female partner 42.0 (37.4 to 46.5) 41.7 (38.3 to 45.1)
 Report case to health department 73.2 (69.0 to 77.5) 86.9 (84.7 to 89.2)
 Ask health department to contact partner 18.4 (15.0 to 21.9) 20.6 (17.8 to 23.4)
 Order test-of-cure at 1 mo 40.1 (35.8 to 44.4) 40.4 (37.1 to 43.7)
 Order test re-infection 2 to 6 mo 22.8 (19.1 to 26.5) 23.3 (20.5 to 26.2)
SERVICES IN CLINIC
 Free condoms 18.9 (15.6 to 22.1) 42.8 (39.5 to 46.0)
 Urine-based Chlamydia testing 32.7 (28.6 to 36.7) 47.9 (44.7 to 51.2)
 Azithromycin on site 37.8 (33.6 to 41.9) 52.4 (49.1 to 55.7)
 HIV testing 64.1 (60.0 to 68.2) 76.2 (73.4 to 79.0)
*

Weighted for physician specialty.

Routine defined as response of usually/always.

CI, confidence interval.

While almost half of providers reported routinely ordering a test of cure for Chlamydia, a small proportion reported testing for reinfection. On site availability of Chlamydia related services such as urine-based Chlamydia testing and single-dose azithromycin was not commonly reported (Table 5).

DISCUSSION

This survey of primary care physicians and nurse practitioners in California indicated that, although a substantial proportion of providers report appropriate Chlamydia care practices, many others report practices inconsistent with current screening and management guidelines. A compelling finding is the lack of appropriate screening among providers: too few physicians are routinely screening women age 25 and younger and too many nurse practitioners are routinely screening women over 25. Our survey findings provide direction for future interventions to increase appropriate Chlamydia screening, improve sexual risk assessment, and enhance patient follow-up, especially with regard to the timing of testing for repeat infection.

It appears that the proportion of California providers routinely taking thorough sexual histories is inadequate. While the proportion of providers who reported taking sexual histories was generally higher than national estimates,9 rates have changed little compared with surveys conducted in California several years prior.11,12 The role of primary care providers in assessing sexual risk is crucial to providing STD/HIV preventative care by determining which anatomic sites should be examined and tested and conducting patient-centered risk reduction counseling. It is recommended that all adolescents and adults receive STD/HIV risk assessment and risk reduction counseling during well care visits.21 Screening adolescents for sexual activity, especially high-risk adolescents with limited access to care, is important at all clinic visits, including urgent care. Few providers reported routinely conducting a sexual risk assessment at urgent care visits. This gap should be a target for improved clinical practice in urgent care settings to identify more adolescents in need of STD screening and counseling. Although commonly reported content areas of sexual risk assessment included recent sexual activity, a minority of providers reported routinely asking specifics about gender of partners, number of partners, or sexual practices. This finding was consistent with other surveys that evaluated components of sexual history taking.10,12,22

Despite current recommendations to screen all sexually active women age 25 and younger for chlamydial infection, the rates of reported routine screening were disappointing, especially among physicians. The rate in California appears higher than some national physician estimates,7 but lower than the self-reported screening rate found among primary care physician and nurse practitioners in Colorado.23 Independent predictors of screening practices identified in this study will be helpful in targeting outreach and education to primary care providers to improve screening rates. For example, internists, family practitioners, general practitioners, and nurse practitioners in private practice settings may benefit from continuing professional education. Provider outreach could address the misperceptions and barriers to screening, including perceptions that Chlamydia prevalence is too low to warrant screening. Prevalence monitoring in California has consistently found high rates of infection among young women even in private and managed care practice settings.24 Increasing the availability of urine-based testing may improve screening rates, as it allows providers to screen women for Chlamydia without performing a pelvic exam. Policies to ensure adequate reimbursement for Chlamydia testing as well as risk assessment and risk-reduction counseling are essential for supporting high quality STD care and clinical practice guidelines.

A high proportion of providers, particularly nurse practitioners, report routinely screening women over age 25 for Chlamydia. Current guidelines recommend screening these women only if they have risk factors such as multiple partners.1,6 Unnecessary screening in low prevalence populations is not cost-efficient and, because the positive predictive value is lower, may lead to an increased proportion of false positive test results.25 Educating both providers and women about prevalence and risk factors for Chlamydia may decrease unnecessary screening.

Deficiencies in repeat testing also were identified. Because the standard treatment efficacy is over 95%, a test of cure for nonpregnant patients treated with a first-line medication is not recommended. Regardless, 40% of providers reported routinely ordering a test of cure. Because of high rates of repeat chlamydial infections and increased risk of reproductive health complications with multiple infections, repeat testing in 2 to 6 months is recommended.1,26,27 Unfortunately, less than one quarter of providers reported retesting women in 2 to 6 months after Chlamydia treatment. The cost efficiency of Chlamydia management can be improved by developing innovative ways to conduct retesting and educating providers to follow clinical guidelines for test of cure and re-testing.

There are several limitations to this study. Although a physician response rate of less than two thirds is not uncommon, results may be less representative of primary care physicians. It is noteworthy that demographics of nonresponding physicians were similar to respondents. Using a professional society membership to identify nurse practitioner participants limits the generalizability of our results to all nurse practitioners in California. It is possible that members of this organization are more proactive and reflect higher practice standards than nonmembers. In addition, this study relies on provider self-report, which may not reflect true practice. Because of social desirability and awareness of appropriate practice, self-report may overestimate quality clinical practice.

Chlamydia remains a significant public health problem, infecting epidemic numbers of young sexually active women. Despite concerted attempts at Chlamydia control, rates in California and throughout the United States remain high. Although this complex problem demands intervention at many levels, a critical part of the solution is widespread, high quality STD/HIV preventive services. This study makes a significant contribution to this effort by identifying gaps in risk assessment, Chlamydia screening, and management practices of primary care providers as well as inadequacies in available onsite services and structural and attitudinal barriers to routine screening. In addition to targeted provider education, interventions that increase reimbursement for prevention, testing, and treatment services may well improve the quality of STD care for young women.

Acknowledgments

The authors would like to thank Jessica Frasure and Ali Stirland for assistance with manuscript preparation. This project was supported in part by the Centers for Disease Control and Prevention (Comprehensive STD Prevention Systems and Infertility Prevention Project Grant #H25/CCH904362), the California STD/HIV Prevention Training Center (Grant # R30/CCR915467-07), and the California Department of Health Services.

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