1. 1Department of Obstetrics and Gynaecology, The Chinese University of Hong Kong, Hong Kong Special Administrative Region, China
2. 2Department of Medicine and Therapeutics, The Chinese University of Hong Kong, Hong Kong Special Administrative Region, China
3. 3Li Ka Shing Institute of Health Sciences, The Chinese University of Hong Kong, Hong Kong Special Administrative Region, China
4. 4Hong Kong Institute of Diabetes and Obesity, The Chinese University of Hong Kong, Hong Kong Special Administrative Region, China
5. 5Mater Research, The University of Queensland, South Brisbane, Queensland, Australia
6. 6Department of Research and Evaluation, Kaiser Permanente Southern California, Pasadena, CA
7. 7Department of Obstetrics and Gynecology, Keck School of Medicine, University of Southern California, Los Angeles, CA
8. 8Faculty of Health and Medicine, University of Newcastle, Callaghan, New South Wales, Australia
9. 9Department of Obstetrics and Gynecology, Mother Infant Research Institute, Tufts Medical Center, Boston, MA