[1] Univ Hosp Birmingham NHS Fdn Trust, Corp Nursing, Birmingham, England
[2] Univ Birmingham, Inst Clin Sci, Birmingham, W Midlands, England
[3] Univ Coll London Hosp NHS Fdn Trust, Canc Clin Trials Unit, London, England
[4] Univ Coll London Hosp NHS Fdn Trust, Ctr Nurse Midwife & Allied Hlth Profess Led Res C, 250 Euston Rd, London NW1 2PG, England
[5] UCL, Dept Targeted Intervent, London, England