[1] Univ Nottingham, Sch Nursing Midwifery & Physiotherapy, Nottingham NG7 2RD, England
[2] Univ Nottingham, Inst Mental Hlth, Nottingham NG7 2RD, England
[3] De Montfort Univ, Fac Hlth & Life Sci, Leicester LE1 9BH, Leics, England
[4] Aalesund Univ Coll, Fac Hlth Sci, Alesund, Norway
[5] Univ Derby, Derby DE22 1GB, England
[6] Derbyshire Healthcare Fdn Trust, Kingsway Hosp, Mental Hlth Res Unit, Derby, England