[1] Birmingham City Univ, Sch Social Sci, 4 Cardigan St, Birmingham B4 7BD, W Midlands, England
[2] Univ Nottingham, Dept Therapies & Publ Hlth, Univ Pk Campus, Nottingham NG7 2RD, England
[3] Univ Manchester, Ctr Hlth Pychol, 46 Grafton St, Manchester M13 9NT, Lancs, England
[4] Bangor Univ, Sch Psychol, Penrallt Rd, Bangor LL57 2AS, Gwynedd, Wales