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机构:
Univ Calif Los Angeles, Fielding Sch Publ Hlth, Dept Epidemiol, 650 Charles E Young Dr S, Los Angeles, CA 90095 USA
Stanford Univ, Sch Med, Dept Pediat, Div Neonatol,Perinatal Epidemiol & Hlth Outcomes, Palo Alto, CA 94304 USA
Lucile Packard Childrens Hosp, Palo Alto, CA 94304 USA
Calif Perinatal Qual Care Collaborat, Palo Alto, CA 94305 USA Univ Ulsan, Coll Med, Ulsan Univ Hosp, Dept Pediat, Ulsan 44033, South Korea