[1] UCL, UCL Arts & Sci Dept, 33-35 Torrington Pl, London WC1E 7LA, England
[2] Univ Reading, Pharm Dept, Reading, Berks, England
[3] Kings Coll London, Natl Addict Ctr, Inst Psychiat Psychol & Neurosci, Addict Dept, London, England
[4] Univ Hull, Fac Hlth Sci, Inst Clin & Appl Hlth Res ICAHR, Kingston Upon Hull, N Humberside, England
[5] Univ Birmingham, Sch Psychol, Inst Mental Hlth, Birmingham, W Midlands, England
[6] Solihull Integrated Addict Serv, Solihull, W Midlands, England
[7] Imperial Coll London, Dept Brain Sci, Div Psychiat, London, England
[8] Univ Southampton, Fac Med, Southampton, Hants, England
[9] Kings Coll London, Sch Canc & Pharmaceut Sci, London, England
[10] UCL, UCL Sch Pharm, London, England
[11] UCL, Dept Clin Educ & Hlth Psychol, London, England