Table 2.

Key publications in the field of ectopic pregnancy research. These articles were published since 1900 and cited 200 times or more

Title	Publication year	Country	Citations	Journal
WHO analysis of causes of maternal death: a systematic review. Khan et al. 47	2006	Switzerland, UK, Argentina	534	Lancet
Comparative genomes of Chlamydia pneumoniae and C. trachomatis. Kalman et al. 48	1999	USA	457	Nat Genet
Pelvic inflammatory disease and fertility. Westström et al. 49	1992	USA	347	Sex Transm Dis
Genital chlamydial infections—epidemiology and reproductive sequelae. Cates et al. 50	1991	USA	345	Am J Obstet Gynecol
Current methods of laboratory diagnosis of Chlamydia trachomatis infections. Black et al. 51	1997	USA	293	Clin Microbiol Rev
Prevalence of chlamydial and gonococcal infections among young adults in the United States. Miller et al. 52	2004	USA	270	Jama—J Am Med Assn
The epidemiology of smoking during pregnancy. Cnattingius 53	2004	Sweden	250	Nicotine Tob Res
Single-dose methotrexate—an expanded clinical-trial. Stovall and Ling54	1993	USA	238	Am J Obstet Gynecol
A method of screening for ectopic pregnancy and its indications. Kadar et al. 55	1981	USA	235	Obstet Gynecol
Maternal age and fetal loss: population based register Linkage study. Nybo Andersen et al. 56	2000	Denmark	234	Brit Med J
Treatment of interstitial ectopic pregnancy with methotrexate—report of a successful case. Tanaka et al. 57	1982	Japan	233	Fertil Steril
Discriminatory HCG zone—its use in the sonographic evaluation for ectopic pregnancy. Kadar et al. 58	1981	USA, France	229	Obstet Gynecol
Conservative laparoscopic treatment of 321 ectopic pregnancies. Pouly et al. 59	1986	France	228	Fertil Steril
Incidence, trends, and risks of ectopic pregnancy in a population of woman. Westströmet al. 60	1981	Sweden	214	Brit Med J
Early termination of pregnancy with mifepristone (RU-486) and the orally active prostaglandin misoprostol. Peyron et al.61	1993	France	216	N Engl J Med