Koen P Grootens1,2, Erwin G T M Hartong3. 1. k.grootens@reiniervanarkel.nl. 2. Reinier van Arkel Mental Health Institute, 's-Hertogenbosch; and Department of Psychiatry, Radboud University Medical Centre, Nijmegen, the Netherlands. 3. Department of Psychiatry, Canisius-Wilhelmina Hospital, Nijmegen, the Netherlands.