1. Division of Neonatal and Developmental Medicine, Department of Pediatrics Stanford University School of Medicine Stanford California USA
2. Division of Maternal‐Fetal Medicine and Obstetrics, Department of Obstetrics and Gynecology Stanford University School of Medicine Stanford California USA
3. Department of Epidemiology and Biostatistics University of California San Francisco California USA
4. Department of Pediatrics University of Florida College of Medicine Gainesville Florida USA
5. Department of Epidemiology University of Florida College of Public Health and Health Professions and College of Medicine Gainesville Florida USA
6. Division of Neonatology, Department of Pediatrics University of Utah School of Medicine Salt Lake City Utah USA
7. Center for Birth Defects Research and Prevention Massachusetts Department of Public Health Boston Massachusetts USA
8. Division of Medical Genetics, Department of Pediatrics University of Utah School of Medicine Salt Lake City Utah USA