1. Departments of Laboratory Medicine (T.P.L.), Singapore 119074
2. Medicine (S.L.K., S.-A.E.S.T., E.S.T., C.M.K.), National University Hospital, Singapore 119074
3. Department of Clinical Biochemistry (D.J.H.), Addenbrooke's Hospital, Cambridge CB2 2QR, United Kingdom
4. Saw Swee Hock School of Public Health (E.C.), National University of Singapore, Singapore 117597
5. The Endocrine Clinic (S.C.H.), Mount Elizabeth Medical Centre, Singapore 228510