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机构:
Eunice Kennedy Shriver Natl Inst Child Hlth & Hum, Perinatol Res Branch, Program Perinatal Res & Obstet, Div Intramural Res,NIH, Bethesda, MD USA
Eunice Kennedy Shriver Natl Inst Child Hlth & Hum, Perinatol Res Branch, Program Perinatal Res & Obstet, Div Intramural Res,NIH, Detroit, MI USA
Univ Michigan, Dept Obstet & Gynecol, Ann Arbor, MI 48109 USA
Michigan State Univ, Dept Epidemiol & Biostat, E Lansing, MI 48824 USA Univ Utah, Dept Obstet & Gynecol, Salt Lake City, UT 84108 USA