1. Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore (V.H.E.C., G.K.H.L., A.S.T.L., Y.-K.T., C.G., V.K.S., B.Y.Q.T., L.L.L.Y.).
2. Department of Medicine, Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore (C.-H.T.).
3. Division of Interventional Radiology, Department of Diagnostic Imaging (A.G., C.Y.), National University Health System, Singapore.
4. Division of Neurology, Department of Medicine (B.P.L.C., V.K.S., B.Y.Q.T., L.L.L.Y.), National University Health System, Singapore.