1. Division of Medical Sciences and Graduate Entry Medicine, School of Medicine, University of Nottingham; Department of Surgery and Anaesthesia; Uttoxeter New Road Derby UK DE22 3DT
2. The University of Nottingham; Division of Epidemiology and Public Health; Clinical Sciences Building Nottingham City Hospital NHS Trust Campus, Hucknall Road Nottingham UK NG5 1PB
3. Frimley Health NHS Foundation Trust, Frimley Park Hospital; Department of Anaesthesia; Portsmouth Road Frimley UK GU16 7UJ
4. Royal Derby Hospital; Department of Respiratory Medicine; Uttoxeter Road Derby UK DE22 3NE
5. University of Nottingham; Division of Health Sciences, School of Medicine; Medical School, Royal Derby Hospital, Uttoxeter Road Derby UK DE22 3DT