Kalso Eija, Aldington D J, Moore R A
Institute of Clinical Medicine, Faculty of Medicine, University of Helsinki, Pain Clinic, Department of Anaesthesia and Intensive Care Medicine, Helsinki University Central Hospital, PO Box 140, FIN-00029 HUS, Finland.
BMJ. 2013 Dec 19;347:f7339. doi: 10.1136/bmj.f7339.