From the Department of Neurology (T.M.M., A.v.R., H.B.K., R.A.J.E., B.R.B., M.M.V.), Donders Institute for Brain, Cognition and Behaviour, Radboud University Medical Center, Nijmegen; Department of Laboratory Medicine (T.M.M., H.B.K., M.M.V.), Radboud University Medical Center, Nijmegen; Parkinson Center Nijmegen (T.M.M., A.v.R., R.A.J.E., B.R.B., M.M.V.), the Netherlands; and Department of Neurology (P.O., M.O.), Ulm University Hospital, Germany. (At 2019-03-26)