作者单位:Columbia Univ, Med Ctr, Mailman Sch Publ Hlth, Dept Epidemiol, New York, NY USA[1]Inst Publ Hlth, Child Hlth & Dev Studies, Berkeley, CA USA[2]Harvard Univ, Brigham & Womens Hosp, Sch Med, Obstet & Gynecol Epidemiol Ctr,Dept Obstet Gyneco[3]Columbia Univ, Med Ctr, Herbert Irving Comprehens Canc Ctr, New York, NY USA[4]