1 Department of Child and Adolescent Psychiatry, Psychosomatics and Psychotherapy, Autism Research and Intervention Center of Excellence, University Hospital Frankfurt, Goethe-Universität, Deutschordenstr. 50, 60528, Frankfurt, Germany. c.freitag@em.uni-frankfurt.de.
2 Department of Biological Psychology, Netherlands Twin Register, Vrije Universiteit, Amsterdam, The Netherlands.
3 Department of Cognitive Neuroscience, Donders Institute for Brain, Cognition and Behaviour, Centre for Neuroscience, Radboud University Medical Center, Nijmegen, The Netherlands.
4 Department of Human Genetics and Department of Psychiatry, Donders Institute for Brain, Cognition and Behaviour, Centre for Neuroscience, Radboud University Medical Center, Nijmegen, The Netherlands.
5 European Commission, DG Research & Innovation, Brussels, Belgium.