1. From the Department of Epidemiology (M.M.G.), Mailman School of Public Health, New York, NY; the Department of Society, Human Development, and Health (M.M.G.), Harvard School of Public Health, Boston, Mass; the Department of Public Health (M.A.), Erasmus Medical Center, Rotterdam, The Netherlands; and the Center for Population and Development Studies (M.A.), Harvard School of Public Health, Boston, Mass.