1 Department of Special Needs Education and Youth Care, University of Groningen, Grote Rozenstraat 38, 9712 TJ Groningen, The Netherlands.
2 Kempe Center for the Prevention and Treatment of Child Abuse and Neglect, Department of Pediatrics, University of Colorado School of Medicine, 13123 East 16th Avenue, B390, Aurora, CO 80045, USA.
3 The Louis and Gabi Weisfeld School of Social Work, Bar-Ilan University, Ramat-Gan 5290002, Israel.