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机构:
Univ Minnesota, Dept Med, Minneapolis, MN 55455 USA
Case Western Reserve Univ, Dept Pediat, Cleveland, OH 44106 USA
Case Western Reserve Univ, Dept Med, Cleveland, OH 44106 USA
Case Western Reserve Univ, Dept Epidemiol & Biostat, Cleveland, OH 44106 USA Univ Minnesota, Div Epidemiol & Community Hlth, Minneapolis, MN USA