1. Division of Epidemiology School of Public Health University of California Berkeley Berkeley California USA
2. Division of Neonatal & Developmental Medicine, Department of Pediatrics, and Division of Maternal‐Fetal Medicine and Obstetrics, Department of Obstetrics and Gynecology Stanford University School of Medicine Palo Alto California USA
3. Department of Public Health and Recreation College of Health and Human Sciences San Jose State University San Jose California USA
4. School of Public Health Oregon Health & Science University‐Portland State University Portland Oregon USA
5. Rory Meyers College of Nursing New York University New York New York USA
6. Division of Maternal‐Fetal Medicine, Department of Obstetrics & Gynecology Stanford University School of Medicine Stanford California USA