[1] Medway NHS Fdn Trust, Medway, England
[2] Univ Birmingham, Inst Clin Sci, Coll Med & Dent Sci, Sch Nursing & Midwifery, Birmingham, England
[3] Univ Ottawa, Sch Nursing, Ottawa, ON, Canada
[4] Somerset Fdn Trust, Intens Care, Taunton, England
[5] Kings Coll Hosp NHS Fdn Trust, Dept Crit Care, London, England