[1] Keele Univ, Sch Social Sci & Publ Policy, Keele, Staffs, England
[2] CNWL NHS Fdn Trust, London, England
[3] Univ Westminster, Fac Sci & Technol, Psychol, London, England
[4] Homerton Univ Hosp NHS Fdn Trust, London, England
[5] Chelsea & Westminster Hosp NHS Fdn Trust, London, England
[6] Publ Hlth England, London, England