1. From the Departments of Neurosurgery (C.A.H., W.M.v.d.B.) and Neurology (W.M.v.d.B., I.S.B., G.W.v.D., A.A., J.v.G., G.J.E.R.), and the Julius Center for Health Sciences and Primary Care (A.A.), University Medical Center Utrecht, Utrecht, The Netherlands.