[1] Queens Univ Belfast, Ctr Evidence & Social Innovat, Sch Nursing & Midwifery, Belfast BT7 1NN, Antrim, North Ireland
[2] Open Univ, Fac Wellbeing Educ & Language Studies, Belfast MK7 6AA, Antrim, North Ireland
[3] Queens Univ Belfast, Ctr Evidence & Social Innovat, Sch Social Sci Educ & Social Work, Belfast BT7, Antrim, North Ireland
[4] Elemental Software, Derry BT48 6HP, England
[5] Univ Ulster, Psychol Res Inst, Bamford Ctr Mental Hlth, Newtownabbey BT37 0QB, North Ireland
[6] UCL, UCL Div Psychiat, London WC1E 6BT, England