1. FHI 360; Clinical Sciences; 359 Blackwell St, Suite 200 Durham North Carolina USA 27701
2. University of North Carolina, School of Medicine; Obstetrics and Gynecology; CB#7570 Chapel Hill North Carolina USA 27599-7570
3. FHI 360 and UNC School of Medicine; Quantitative Sciences; 359 Blackwell Street, Suite 200 Suite 200 Durham North Carolina USA 27701
4. Centers for Disease Control and Prevention; Division of Reproductive Health; MS K-34, 4770 Buford Highway, NE Atlanta Georgia USA 30341
5. FHI 360; Division of Biostatistics; 359 Blackwell St, Suite 200 Durham, NC North Carolina USA 27709