1. Department of Obstetrics & Gynaecology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
2. Singapore Institute for Clinical Sciences, Agency for Science, Technology and Research (A*STAR), Singapore
3. MRC Lifecourse Epidemiology Unit and NIHR Southampton Biomedical Research Centre, University of Southampton and University Hospital Southampton NHS Foundation Trust, Southampton, United Kingdom
4. Faculty of Medicine, University of Southampton, Southampton, United Kingdom