[1] Keele Univ, Natl Inst Hlth & Care Res NIHR Doctoral Fellow, Sch Med, Keele, England
[2] London Ambulance Serv NHS Trust, London, England
[3] Natl Inst Hlth & Care Excellence NICE, Manchester, England
[4] South West London & St Georges Mental Hlth NHS Tru, London, England
[5] Univ Manchester, Manchester Acad Hlth Sci Ctr, Psychiat & Populat Hlth, Ctr Mental Hlth & Safety, Manchester, England
[6] Univ Manchester, Greater Manchester Mental Hlth NHS Fdn Trust, NIHR Greater Manchester Patient Safety Translat Re, Manchester, England
[7] Univ Manchester, NIHR Greater Manchester Patient Safety Translat Re, Ctr Mental Hlth & Safety, Manchester, England