1 University Hospital of Child and Adolescent Psychiatry and Psychotherapy, University of Bern, Bolligerstrasse 111, 3000, Bern 60, Switzerland. frauke.schultze-lutter@kjp.unibe.ch.
2 University Hospital of Child and Adolescent Psychiatry and Psychotherapy, University of Bern, Bolligerstrasse 111, 3000, Bern 60, Switzerland.