作者单位:Univ Calif San Diego, Dept Pediat, San Diego, CA USA[1]Univ Calif San Francisco, Dept Psychiat & Behav Sci, San Francisco, CA USA[2]Univ Calif San Diego, Dept Psychiat, San Diego, CA USA[3]Univ Calif San Diego, Herbert Wertheim Sch Publ Hlth & Longev Sci, San Diego, CA USA[4]Univ Calif San Francisco, Calif Preterm Birth Initiat, San Francisco, CA USA[5]