[1] St Georges Univ London, Populat Hlth Inst, Cranmer Terrace, London SW17 0RE, England
[2] Douglas Coll, Dept Child Family & Community Studies, New Westminster, BC, Canada
[3] London South Bank Univ, Fac Hlth & Social Care, London, England
[4] Kings Coll London, Dept Hlth Serv & Populat Res, Inst Psychiat Psychol & Neurosci, London, England
[5] Univ Oxford, Dept Psychiat, Oxford, England
[6] Tavistock Ctr, London, England
[7] Cardiff Univ, Sch Social Sci, WISERD, Cardiff, S Glam, Wales
[8] Kings Coll London, Inst Psychiat, Dept Psychol Psychol & Neurosci, London, England