1. Department of Global Public Health Karolinska Institutet Stockholm Sweden
2. Centre for Academic Mental Health, Population Health Sciences, Bristol Medical School University of Bristol Bristol UK
3. MRC Integrative Epidemiology Unit University of Bristol Bristol UK
4. A. J. Drexel Autism Institute Drexel University Philadelphia Pennsylvania USA
5. Centre for Epidemiology and Community Medicine Region Stockholm Stockholm Sweden
6. NIHR Biomedical Research Centre University of Bristol Bristol UK
7. Bristol Autism Spectrum Service Avon and Wiltshire Partnership NHS Mental Health Trust Bristol UK
8. Department of Epidemiology and Biostatistics Drexel University School of Public Health Philadelphia Pennsylvania USA