1. Shenzhen Maternity & Child Healthcare Hospital, Shenzhen, China;
2. Faculty of Medicine, The Jockey Club School of Public Health and Primary Care, The Chinese University of Hong Kong, Hong Kong, China;
3. Section of Endocrinology, Department of Pediatrics, Shenzhen Maternity & Child Healthcare Hospital, Shenzhen, China;
4. Obstetrics Department, Shenzhen Maternity & Child Healthcare Hospital, Shenzhen, China