Department of Paediatrics, Yong Loo Lin School of Medicine, National University of Singapore, Singapore. Khoo Teck Puat-National University Children's Medical Institute, National University Health System, Singapore. Clinical Nutrition Research Center, Singapore Institute for Clinical Sciences, Agency for Science, Technology and Research, Singapore. Singapore Bioimaging Consortium, Agency for Science, Technology and Research, Singapore. Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore. Singapore Institute for Clinical Sciences, Agency for Science, Technology and Research, Singapore. Department of Endocrinology, Division of Medicine, Tan Tock Seng Hospital, Singapore. Saw Swee Hock School of Public Health, National University of Singapore, Singapore.