1. University of North Carolina, School of Medicine; Obstetrics and Gynecology; CB#7570 Chapel Hill North Carolina USA 27599-7570
2. FHI 360; Clinical Sciences; P.O. Box 13950 Research Triangle Park North Carolina USA 27709
3. London Community Healthcare; Westside Contraceptive Services; Raymede Clinic, Exmoor St London UK W10 6DZ
4. Gynuity Health projects; 15 East 26th Street New York New York USA NY10010