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Eunice Kennedy Shriver Natl Inst Child Hlth & Hum, Div Populat Hlth Res, Div Intramural Res, Epidemiol Branch, Bethesda, MD 20892 USA
Natl Univ Singapore, Bia Echo Asia Ctr Reprod Longev & Equal, Yong Loo Lin Sch Med, Dept Obstet & Gynecol, Singapore, Singapore Eunice Kennedy Shriver Natl Inst Child Hlth & Hum, Div Populat Hlth Res, Div Intramural Res, Epidemiol Branch, Bethesda, MD 20892 USA