1. Women's Hospital, School of Medicine; Zhejiang University; Hangzhou China
2. Institute of Women's Health, University College London (UCL); London UK
3. Department of Statistical Science; UCL; London UK
4. Center for Obesity Research; UCL; London UK
5. National Institute of Health Research, University College London Hospitals National Health Service (NHS) Foundation Trust (UCLH) Biomedical Research Centre; London UK