Sichuan University - National Office for Maternal and Child Health Surveillance of China, Sichuan University - National Office for Maternal and Child Health Surveillance of China, Sichuan University, Chinese Academy of Sciences (CAS), Chinese Academy of Sciences (CAS), Sichuan University - National Office for Maternal and Child Health Surveillance of China, Sichuan University - National Office for Maternal and Child Health Surveillance of China, Sichuan University - National Office for Maternal and Child Health Surveillance of China, Sichuan University - National Office for Maternal and Child Health Surveillance of China, Monash University - School of Public Health and Preventive Medicine and Sichuan University - National Office for Maternal and Child Health Surveillance of China

Sichuan University - National Office for Maternal and Child Health Surveillance of China, Sichuan University - National Office for Maternal and Child Health Surveillance of China, Sichuan University - National Office for Maternal and Child Health Surveillance of China, Sichuan University - National Office for Maternal and Child Health Surveillance of China, Sichuan University - National Office for Maternal and Child Health Surveillance of China, Sichuan University - National Office for Maternal and Child Health Surveillance of China, Sichuan University - National Office for Maternal and Child Health Surveillance of China, Sichuan University - National Office for Maternal and Child Health Surveillance of China, Sichuan University - National Office for Maternal and Child Health Surveillance of China, Sichuan University - National Office for Maternal and Child Health Surveillance of China, Sichuan University - National Office for Maternal and Child Health Surveillance of China and Sichuan University, West China Second University Hospital - Department of Pediatrics