1. Faculty of Medicine, School of Health Sciences, University of Iceland, Reykjavik, Iceland;
2. Landspitali University Hospital, Mental Health Services, Reykjavik, Iceland;
3. Department of Psychosis Studies, Institute of Psychiatry, Psychology and Neuroscience, Kings College, London, UK;
4. National Psychosis Unit, Bethlem Royal Hospital, South London and Maudsley NHS Foundation Trust, London, UK