Angela Hassiotis1, Roger Almvik2, Frans Fluttert3. 1. Division of Psychiatry, University College London, London W1T 7BN, UK; Camden and Islington NHS Foundation Trust, London, UK. Electronic address: a.hassiotis@ucl.ac.uk. 2. St Olavs University Hospital, Centre for Research and Education in Forensic Psychiatry, Trondheim, Norway; Department of Mental Health, Norwegian University of Science and Technology, Trondheim, Norway. 3. Molde University College, Centre for Research and Education in Forensic Psychiatry, Oslo University Hospital, Oslo, Norway; Van Mesdagkliniek Hospital, Groningen, Netherlands; University of Southern Denmark, Odense, Denmark.