1. Reproductive Biology and Medicine Branch (S.K.B., M.W., L.K.N.), Washington, D.C., 20037
2. National Institute of Child Health and Human Development, and Biostatistics and Clinical Epidemiology Service (N.S.), Clinical Center, National Institutes of Health, Bethesda, Maryland 20892
3. George Washington University Weight Management Program (D.R.), Washington, D.C., 20037