Sanders Robert D, Pandharipande Pratik P, Davidson Andrew J, Ma Daqing, Maze Mervyn
Magill Department of Anaesthetics, Intensive Care, and Pain Medicine, Imperial College London, Chelsea and Westminster Hospital, London SW10 9NH, UK.
BMJ. 2011 Jul 20;343:d4331. doi: 10.1136/bmj.d4331.