1. Custodial Institutions Agency, Ministry of Security and Justice, Amsterdam, the Netherlands
2. Dept Psychiatry, Radboud University Medical Centre, Nijmegen, the Netherlands
3. Dept Criminal Law, Law School, Radboud University Nijmegen, Nijmegen, the Netherlands
4. Forensic Psychiatric Centre Nijmegen, Pompefoundation, Nijmegen, the Netherlands
5. Behavioural Science Institute, Radboud University Nijmegen, Nijmegen, the Netherlands