1. MRC Integrative Epidemiology Unit; (IEU) at the University of Bristol; UK
2. UK Centre for Tobacco and Alcohol Studies, School of Experimental Psychology; University of Bristol; UK
3. School of Social and Community Medicine; University of Bristol; UK
4. Campbell Family Mental Health Research Institute; Centre for Addiction and Mental Health (CAMH); Toronto Canada
5. Department of Pharmacology and Toxicology, and Psychiatry; University of Toronto; Canada
6. School of Experimental Psychology; University of Bristol; UK
7. MRC Biostatistics Unit; Cambridge UK