1. Department of Anaesthesia Leicester Royal Infirmary Leicester UK
2. Department of Anaesthesia St Michael's Hospital Bristol UK
3. Nuffield Department of Anaesthesia Oxford University Hospital NHS Trust Oxford UK
4. Department of Anaesthesia University Hospitals Southampton Foundation Trust Southampton UK
5. Department of Anaesthesia Northampton General Hospital Northampton UK
6. Department of Anaesthesia James Cook University Hospital Middlesborough UK
7. Leeds University Leeds UK