1. Division of Birth Cohort Study Guangzhou Women and Children's Medical Center Guangzhou Medical University Guangzhou China
2. Provincial Key Clinical Specialty of Woman and Child Health Guangdong China
3. Provincial Clinical Research Center for Child Health Guangdong China
4. Institute of Applied Health Research College of Medical and Dental Sciences University of Birmingham Birmingham UK
5. WHO Collaborating Centre for Women's Health Institute of Metabolism and Systems Research University of Birmingham Birmingham UK
6. Department of Obstetrics and Gynecology School of Medicine Monash University Melbourne Australia