1. Burt ConsultancyLLC. Durham North Carolina USA
2. Department of PsychologyUniversity of Bath UK
3. School of Social and Community MedicineUniversity of Bristol Bristol UK
4. Department of Medicine, Division of Clinical PharmacologyDuke Clinical Research Unit Durham North Carolina USA
5. MRC Integrative Epidemiology Unit, UK Centre for Tobacco and Alcohol Studies, School of Experimental PsychologyUniversity of Bristol UK