1. Ed Major Critical Care Unit, Morriston Hospital, Swansea, UK
2. Intensive Care Unit, Royal Glamorgan Hospital, Llantrisant, UK
3. Swansea Trials Unit, Swansea University Medical School, Swansea, UK
4. Ysbyty Gwynedd, Bangor, Gwynedd, UK
5. Royal Gwent Hospital, Newport, Newport, UK
6. Nevill Hall Hospital, Abergavenny, Monmouthshire, UK
7. Glangwili General Hospital, Carmarthen, Carmarthenshire, UK
8. Princess of Wales Hospital, Bridgend, UK
9. University Hospital of Wales Healthcare NHS Trust, Cardiff, UK
10. Bronglais General Hospital, Aberystwyth, Ceredigion, UK
11. Withybush General Hospital, Haverfordwest, Pembrokeshire, UK
12. Wrexham Maelor Hospital, Wrexham, UK
13. Department of Anaesthetics, Glan Clwyd Hospital, Bodelwyddan, UK