Politi Mary C, Dizon Don S, Frosch Dominick L, Kuzemchak Marie D, Stiggelbout Anne M
Department of Surgery, Division of Public Health Sciences, Washington University in St Louis School of Medicine, 660 South Euclid Avenue, Campus Box 8100, St Louis, MO 63112, USA.
BMJ. 2013 Dec 2;347:f7066. doi: 10.1136/bmj.f7066.