1. Medical Classification Centre, Central Manpower Base (X.S., B.Y.Q.T., C.H.S., J.S.W.L., M.D., K.W., D.Y.Z.L., G.G.R.S., E.C.Y.L., C.K.W.K., T.J.Y., D.T.T.C.), Singapore Armed Forces.
2. Department of Cardiology, National Heart Centre, Singapore (X.S., L.K.W., B.Y.T., P.C.Y.L., K.C.M.C., K.L.H., E.T.S.L., C.K.C., W.S.T., T.S.J.C., R.S.T., D.T.T.C.).
3. Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore (B.Y.Q.T., C.H.S.).
4. Department of Cardiology, National University Heart Centre, Singapore (C.H.S., M.D., T.J.Y.).
5. HQ Medical Corps (W.C., L.K.W.), Singapore Armed Forces.
6. Department of Cardiology, Changi General Hospital, Singapore (W.C.).
7. Duke– NUS Medical School, Singapore (B.Y.T., P.C.Y.L., K.C.M.C., K.L.H., C.K.C., R.S.T., D.T.T.C.).