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机构:
US Dept Hlth & Human Serv, Pregnancy Res Branch, Div Obstet & Maternal Fetal Med,, Div Intramural Res,Eunice Kennedy Shriver Natl Ins, Bethesda, MD 20814 USA
Univ Michigan, Dept Obstet & Gynecol, Ann Arbor, MI 48109 USA
Michigan State Univ, Dept Epidemiol & Biostat, E Lansing, MI 48825 USA US Dept Hlth & Human Serv, Pregnancy Res Branch, Div Obstet & Maternal Fetal Med,, Div Intramural Res,Eunice Kennedy Shriver Natl Ins, Bethesda, MD 20814 USA