1. a School of Social Studies , Leiden University of Applied Sciences , Zernickedeef 11, Leiden , the Netherlands
2. b Department of Forensic Child and Youth Care , Amsterdam University , Nieuwe Prinsengracht 130, Amsterdam , the Netherlands
3. c Hartelborcht Correctional Institution , Spijkenisse , the Netherlands
4. d The Netherlands Institute for the Study of Crime and Law Enforcement , Law Faculty, VU University , Postbus 71304, 1008 BH Amsterdam, Amsterdam , the Netherlands