1. University College London; Centre for Anaesthesia and Perioperative Medicine; London UK NW1 2BU
2. University College London; Department Anaesthesia and Critical Care; 235 Euston Rd, Fitzrovia London UK NW1 2BU
3. University Hospital Southampton NHS Foundation Trust; General Intensive Care Unit; Tremona Road Southampton Hampshire UK SO16 6YD
4. Stony Brook Medicine; Department of Anesthesiology; Health Science Tower, Level 4 (Rm 060) Stony Brook NY USA
5. Medical Research Council Clinical Trials Unit; 222 Euston Road London UK NW1 2DA
6. Faculty of Medicine, University of Southampton; Critical Care Group, Clinical and Experimental Sciences; Tremona Road Southampton Hampshire UK SO16 6YD
7. University of Cape Town; Department of Anaesthesia; Anzio Road Observatory 7925 Cape Town Western Cape South Africa 7925
8. St James's Hospital; Department of Anaesthesia; James's Street Dublin Ireland 8
9. University of Washington; Department of Anesthesiology and Pain Medicine; Box 359724 Seattle WA USA 98104
10. Intensive Care National Audit & Research Centre; Napier House 24 High Holborn London UK WC1V 6AZ
11. UCL Centre for Anaesthesia; Department of Anaesthesia; 3rd floor Podium University College Hospital, 235 Euston Road London UK NW1 2BU