1. Institute for Sex Research and Forensic Psychiatry, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
2. Department of Medical Psychology, VU University Medical Center, Amsterdam, The Netherlands
3. Technical University Braunschweig, Braunschweig, Germany
4. Department of Sexology and Gender Problems, Ghent University Hospital, Ghent, Belgium
5. Department of Neuropsychiatry and Psychosomatic Medicine, Rikshospitalet, Oslo, Norway