[1] SUNY Buffalo, Dept Social & Prevent Med, Sch Publ Hlth & Hlth Profess, Buffalo, NY 14214 USA
[2] SUNY Buffalo, Dept Gynecol & Obstet, Sch Med & Biomed Sci, Buffalo, NY 14214 USA
[3] SUNY Buffalo, Dept Clin Sci Lab, Sch Med & Biomed Sci, Buffalo, NY 14214 USA
[4] NICHD, Epidemiol Branch, Div Epidemiol Stat & Prevent Res, NIH, Bethesda, MD USA