1. Department of Anaesthesia, Pain Medicine and Hyperbaric Medicine, Royal Adelaide Hospital and Discipline of Acute Care Medicine, Adelaide Medical School, University of Adelaide, Adelaide, South Australia, Australia
2. Nuffield Department of Anaesthetics, Oxford University Hospitals NHS Foundation Trust, Oxford, United Kingdom
3. Department of Anaesthesia and Perioperative Medicine, West Suffolk NHS Foundation Trust, Bury St Edmunds, Suffolk, United Kingdom
4. Gastrointestinal Surgery, Nottingham Digestive Diseases Centre, National Institute for Health Research (NIHR) Nottingham Biomedical Research Centre, Nottingham University Hospitals NHS Trust and University of Nottingham, Queen's Medical Centre, Nottingham, United Kingdom
5. MRC Versus Arthritis Centre for Musculoskeletal Ageing Research, School of Life Sciences, University of Nottingham, Queen’s Medical Centre, Nottingham, United Kingdom