1. From the Department of Radiology (I.vdS.), University Medical Centre, Utrecht, the Netherlands; the Julius Center for Health Sciences and Primary Care (A.A.), University Medical Centre, Utrecht, the Netherlands; the Department of Neurology (M.J.W., J.vG., G.R.), University Medical Center, Utrecht, the Netherlands; Neurovascular Research Unit (A.M.), University of Oxford, United Kingdom; and UK Cochrane Centre (M.C.), Oxford, UK.