1. Oxford University Hospitals NHS Foundation Trust, UK
2. Heart of England NHS Foundation Trust, Birmingham, UK
3. Hampshire Hospitals NHS Foundation Trust, Basingstoke, UK
4. Cwm Taf University Health Board, Royal Glamorgan Hospital, Llantrisant, UK
5. School of Medicine, Cardiff University, UK
6. Aneurin Bevan University Health Board, Royal Gwent Hospital, Newport, UK
7. Department of Anaesthesia Intensive Care and Pain Medicine, Division of Population Medicine, Cardiff University, UK