1. Oxford UK
2. Plymouth UK
3. Division of Population Health Sciences, University of Dundee; Ninewells Hospital & Medical School Kirsty Semple Way Dundee UK DD2 4DB
4. Teesside University; Institute of Health and Social Care; Parkside Middlesbrough UK TS1 3BA
5. University of Edinburgh, Western General Hospital; Anaesthesia & Pain Medicine; Edinburgh UK
6. University of Dundee; Division of Population Health Sciences; Dundee UK DD2 4BF