1. Department of Anaesthesia and Intensive Care, Royal Surrey County Hospital NHS Foundation Trust, Guildford, UK
2. Department of Anaesthesia and Intensive Care, Royal United Hospital Bath NHS Trust, Bath, UK
3. Department of Anaesthesia and Perioperative Medicine, South Devon Healthcare NHS Foundation Trust, Torbay Hospital, Torquay, UK
4. Department of Anaesthesia and Intensive Care, Royal Devon and Exeter NHS Foundation Trust, Exeter, UK
5. School of Health Studies, University of Bradford, Bradford, UK
6. Royal Surrey County Hospital, Guildford
7. Royal United Hospital Bath, Bath
8. Torbay Hospital, Torquay
9. Royal Devon and Exeter Hospital, Exeter