[1] Univ Edinburgh, Dept Psychol, Edinburgh EH8 9JZ, Midlothian, Scotland
[2] Univ Sheffield, Sch Nursing & Midwifery, Sheffield, S Yorkshire, England
[3] Univ Hull, Hull York Med Sch, Kingston Upon Hull HU6 7RX, N Humberside, England
[4] Leeds Metropolitan Univ, Fac Hlth, Leeds LS1 3HE, W Yorkshire, England
[5] Univ Hull, Fac Hlth & Social Care, Kingston Upon Hull HU6 7RX, N Humberside, England
[6] Royal Edinburgh & Associated Hosp, Edinburgh Young Peoples Unit, Edinburgh, Midlothian, Scotland