1. From the Department of Genetics (F.G., E.N.d.B., M.B.-S., C.C.V.-B., J.K., J.d.B.-B., B.S.-R., D.S.V., H.W., C.C.v.D.), University Medical Center Groningen, University of Groningen, Groningen, the Netherlands; and Department of Neurology (J.J.d.V.), University Medical Center Groningen, University of Groningen, Groningen, the Netherlands.