1 Department of Neurology (A.J.E.W., R.Z., M.A.J.T.), and Department of Genetics (F.V., A.H.v.d.H., T.J.d.K.), University Medical Center Groningen, University of Groningen; Department of Pediatrics (J.M.), Deventer Hospital, The Netherlands; and Parkinson's Disease and Movement Disorders Unit (E.T.), Hospital Clinic of Barcelona, Institut Clínic de Neurociències, Barcelona, Spain.