1. Department of Obstetrics and Gynecology, David Geffen School of Medicine at University of California, Los Angeles, California
2. Department of Medicine Statistics Core, David Geffen School of Medicine at University of California, Los Angeles, California
3. Technology Center for Genomics and Bioinformatics, Department of Medicine, David Geffen School of Medicine at University of California, Los Angeles, California
4. Department of Obstetrics and Gynecology and Wisconsin National Primate Research Center, University of Wisconsin, Madison, Wisconsin