[1] UCL, Marie Curie Palliat Care Res Dept, London, England
[2] Cent North West London NHS Fdn Trust, London, England
[3] Cardiff Univ, Sch Med, Div Populat Med, Cardiff, Wales
[4] NHS Educ Scotland, Med Directorate, Edinburgh, Midlothian, Scotland
[5] NHS Educ Scotland, Skills & Improvement Res Collaborat, Safety, Edinburgh, Midlothian, Scotland
[6] Univ Glasgow, Inst Hlth & Wellbeing, Glasgow, Lanark, Scotland
[7] Staffordshire Univ, Sch Hlth & Social Care, Stoke On Trent, Staffs, England
[8] Cardiff Univ, Sch Med, Div Populat Med, Marie Curie Palliat Care Res Ctr, Cardiff, Wales
[9] London Sch Hyg & Trop Med, Fac Epidemiol & Populat Hlth, London, England