1. From the Division of Neurology, Department of Medicine, National University Health System, Singapore (L.L.L.Y., B.Y.Q.T.); Department of Clinical Neuroscience (S.H., T.A., E.L.), Karolinska Institutet, Stockholm, Sweden; Department of Neuroradiology (S.H., T.A.) and Department of Neurology (E.L.), Karolinska University Hospital, Stockholm, Sweden; Department of Diagnostic Imaging (A.G., E.T., S.E.E.) and Emergency Medicine Department (E.L.L., B.S.H.L., W.S.K.), National University Hospital, National...