| Affiliation: | 1. School of Public Health, Peking University Health Science Center, Beijing, China;2. National Center on Birth Defects and Developmental Disabilities, Centers for Disease Control and Prevention, Atlanta, Georgia USA;3. National Center forMaternal and Infant Health Peking University Health Science Center, Beijing, China;4. Peking University Third Hospital,Beijing, China;5. Northwestern UniversityFeinberg School of Medicine, Chicago, Illinois;6. Hospital for Sick Children, Toronto,Ontario, Canada;7. Changshu Maternal andChild Health Care Hospital, Changshu, China;8. Suzhou Mother and Child Health CareCenter, Suzhou, China;9. Jiaxing Maternaland Child Health Care Hospital, Haining Maternal and Child HealthCare Hospital, Haining, China |
