1. Department of Obstetrics and Gynaecology; Yong Loo Lin School of Medicine, National University of Singapore; Singapore City; Singapore
2. Department of Medicine; Yong Loo Lin School of Medicine, National University of Singapore; Singapore City; Singapore
3. Saw Swee Hock School of Public Health; National University of Singapore; Singapore City; Singapore
4. Diabetes Centre; Khoo Teck Puat Hospital; Singapore City; Singapore
5. Singapore Eye Research Institute; National University of Singapore; Singapore City; Singapore
6. Epidemiology and Disease Control Division; Ministry of Health; Singapore City; Singapore