1. Division of Birth Cohort Study; Guangzhou Women and Children's Medical Center; Guangzhou Medical University; Guangzhou China
2. Department of Woman and Child Health Care; Guangzhou Women and Children's Medical Center; Guangzhou Medical University; Guangzhou China
3. Nuffield Department of Population Health; University of Oxford; Oxford UK
4. The Robinson Research Institute; School of Pediatrics and Reproductive Health; University of Adelaide; Adelaide SA Australia
5. Institute of Applied Health Research; University of Birmingham; Birmingham UK
6. Li Ka Shing Faculty of Medicine; School of Public Health; The University of Hong Kong; Hong Kong SAR China
7. Department of Neonatal Surgery; Guangzhou Women and Children's Medical Center; Guangzhou Medical University; Guangzhou China