1 Department of Health Behavior and Biological Sciences, School of Nursing, and The Center for Sexuality and Health Disparities, University of Michigan, Ann Arbor, MI, USA.
2 Department of Reproductive Health and Research, World Health Organization, 1211 Geneva 27, Switzerland.
3 Department of Reproductive Health and Research, World Health Organization, 1211 Geneva 27, Switzerland. Electronic address: sayl@who.int.