Viehl, C. T., R. Kraus, M. Zürcher, T. Ernst, D. Oertli, and C. Kettelhack. “The Acute Physiology and Chronic Health Evaluation II Score Is Helpful in Predicting the Need of Relaparotomies in Patients With Secondary Peritonitis of Colorectal Origin”. Swiss Medical Weekly, vol. 142, no. 2930, July 2012, p. w13640, doi:10.4414/smw.2012.13640.