1. Division of Birth Cohort Study, Guangzhou Women and Children’s Medical Center, Guangzhou Medical University, Guangzhou, China;
2. Department of Obstetrics and Gynecology, Guangzhou Women and Children’s Medical Center, Guangzhou Medical University, Guangzhou, China;
3. Department of Woman and Child Health, Guangzhou Women and Children’s Medical Center, Guangzhou Medical University, Guangzhou, China;
4. Urogynecology and OBGYN Academic Program Development, Guangzhou Women and Children’s Medical Center, Guangzhou Medical University, Guangzhou, China;
5. Institute of Applied Health Research, University of Birmingham, Birmingham, UK;
6. Department of Obstetrics and Gynaecology, Monash University, Clayton, Australia;
7. Department of Neonatal Surgery, Guangzhou Women and Children’s Medical Center, Guangzhou Medical University, Guangzhou, China