[1] Indiana University,Department of Epidemiology and Biostatistics, School of Public Health
[2] Indiana University,Bloomington
[3] Columbia University,Department of Environmental and Occupational Health, School of Public Health
[4] University of California San Diego,Bloomington
[5] Los Angeles Biomedical Research Institute at Harbor-UCLA Medical Center,Department of Obstetrics and Gynecology, Vagelos College of Physicians and Surgeons, Department of Epidemiology, Mailman School of Public Health
[6] University of California Davis,Family Medicine and Public Health, School of Medicine