Table 1.

Characteristics of study participants

Characteristics	N = 28
Age
30–39	7
40–49	8
50–59	8
60–69	5
Gender
Female	10
Male	18
Race
White	24
Black or African American	1
Others	3
Study sites
Duke University Medical Center	8
Case Western Reserve University	5
Medical University of South Carolina	7
Vanderbilt University Medical Center	8