1 University of Groningen, University Medical Centre Groningen, Dept. Genetics, Groningen, Netherlands; Autism Team Northern-Netherlands/Jonx, Department of (Youth) Mental Health and Autism, Lentis Psychiatric Institute, Groningen, the Netherlands. Electronic address: c.m.a.van.ravenswaaij@umcg.nl.
2 Autism Team Northern-Netherlands/Jonx, Department of (Youth) Mental Health and Autism, Lentis Psychiatric Institute, Groningen, the Netherlands; Rob Giel Research Centre, Department of Psychiatry, University Medical Centre Groningen, Groningen, Netherlands.
3 University of Ulm, Department of Neurology, Ulm, Germany.