1. a Department of Obstetrics & Gynecology , Columbia University , New York , USA
2. b International Rescue Committee , Kabul , Afghanistan
3. c US Military HIV Research Program , Walter Reed Army Institute of Research , Rockville , USA
4. d Empiristat Corporation , Mount Airy , USA
5. e US Naval Military Research Unit 3 , Cairo , Egypt
6. f Division of International Health & Cross-cultural Medicine , University of California , San Diego , La Jolla , USA