University of Southern California, University of Southern California, University of Southern California - Department of Population and Public Health Sciences, University of Southern California, University of Southern California, University of Southern California, University of Southern California - Maternal Fetal Medicine Division, University of Southern California - Department of Population and Public Health Sciences, New York University (NYU) - Grossman School of Medicine, New York University (NYU) - Grossman School of Medicine, affiliation not provided to SSRN, University of Southern California, University of Southern California, University of Southern California, University of Southern California - Department of Population and Public Health Sciences and University of Southern California - Department of Population and Public Health Sciences