1. Department of Psychiatry; University of California, San Diego; La Jolla California
2. ALSPAC and School of Social and Community Medicine; University of Bristol; Bristol UK
3. ALSPAC and School of Experimental Psychology; University of Bristol; Bristol UK
4. MRC Integrative Epidemiology Unit; UK Centre for Tobacco and Alcohol Studies; School of Experimental Psychology; University of Bristol; Bristol UK
5. Department of Psychiatry; Virginia Commonwealth University; Richmond Virginia
6. MRC Integrative Epidemiology Unit (IEU); University of Bristol; Bristol UK