Joseph G. Feldman is with the Department of Preventive Medicine and Community Health, SUNY Health Sciences Center at Brooklyn, New York, NY. Howard Minkoff is with the Department of Obstetrics and Gynecology, Maimonides Medical Center and SUNY Health Sciences Center at Brooklyn. Michael F. Schneider and Stephen J. Gange are with the Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Md. Mardge Cohen is with Cook County Hospital, Chicago, Ill. D. Heather Watts is with...