1. Section of Developmental Psychiatry; University of Cambridge; Cambridge United Kingdom
2. Department of Medical Genetics; University of Cambridge; Cambridge United Kingdom
3. Department of Population Studies; Faculty of Epidemiology and Population Health; London School of Hygiene and Tropical Medicine; University of London; London United Kingdom
4. Children's National Medical Center; Washington District of Columbia U.S.A
5. Social Genetic & Developmental Psychiatry Centre & Department of Child & Adolescent Psychiatry; Institute of Psychiatry; King's College London; London United Kingdom
6. Department of Clinical Psychology; Royal Holloway; University of London; London United Kingdom
7. UCL Institute of Child Health; London United Kingdom
8. East Anglian Medical Genetics Service; Addenbrooke's Hospital; Cambridge United Kingdom