1. Epidemiology Branch, Division of Intramural Population Health Research, Eunice Kennedy Shriver National Institute of Child Health and Human Development, Rockville, MD
2. Departments of Biotechnical and Clinical Laboratory Sciences, University at Buffalo, Buffalo, NY
3. Department of Epidemiology and Biostatistics, The George Washington University School of Public Health and Health Services, Washington, DC
4. Program of Reproductive and Adult Endocrinology, Eunice Kennedy Shriver National Institute of Child Health and Human Development, Bethesda, MD
5. School of Community Health, Portland State University, Portland, OR
6. Epidemiology and Environmental Health, University at Buffalo, Buffalo, NY