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机构:
Michigan State Univ, Coll Human Med, Dept Epidemiol, E Lansing, MI 48824 USA
Michigan State Univ, Coll Human Med, Dept Pediat, E Lansing, MI 48824 USA
Michigan State Univ, Coll Human Med, Dept Human Dev, E Lansing, MI 48824 USA Univ Nebraska Med Ctr, Coll Publ Hlth, Ctr Global Hlth & Dev, Dept Epidemiol, Omaha, NE 68198 USA