1. Department of Twin Research and Genetic Epidemiology, King's College London, St Thomas' Campus, SE1 7EH London, UK
2. Department of Genetic Medicine and Development, University of Geneva Medical School, 1211 Geneva, Switzerland
3. Institute for Genetics and Genomics in Geneva (iGE3), University of Geneva, 1211 Geneva, Switzerland
4. Swiss Institute of Bioinformatics, 1211 Geneva, Switzerland
5. Wellcome Trust Sanger Institute, Hinxton CB10 1SA, Cambridge, UK
6. Division of Mental Health and Addiction, NORMENT, KG Jebsen Centre for Psychosis Research, Oslo University Hospital, Oslo 0450, Norway