[1] London Sch Hyg & Trop Med, SPHR L, 15-17 Tavistock Pl, London WC1H 9SH, England
[2] Univ Sheffield, Sch Hlth & Related Res, Regent Court, 30 Regent St, Sheffield S1 4DA, S Yorkshire, England
[3] Univ Bristol, Sch Social & Community Med, Canynge Hall,39 Whatley Rd, Bristol BS8 2PS, Avon, England
[4] Univ Lancaster, Fac Hlth & Med, Div Hlth Res, Lancaster LA1 4YW, England
[5] Univ Bristol, Sch Social & Community Med, Oakfield House, Oakfield Grove BS8 2BN, Clifton, England
[6] Univ Toronto, Dalla Lana Sch Publ Hlth, Hlth Sci Bldg,155 Coll St, Toronto, ON M5T 3M7, Canada
[7] Univ Sunderland, Dept Pharm Hlth & Well Being, Hlth Sci Complex,City Campus, Sunderland SR1 3SD, England