1. From the Behavioral Endocrinology Branch, NIMH, Bethesda, Md.; the Intramural Research Program on Reproductive and Adult Endocrinology, Eunice Kennedy Shriver National Institute of Child Health and Human Development, Bethesda, Md.; the Biostatistics and Clinical Epidemiology Service, Clinical Center, NIH, Bethesda, Md.,; and the Department of Psychiatry, University of North Carolina, Chapel Hill, N.C.