Affiliation: | 1. University of Heidelberg, Medical Faculty, Coordination Centre for Clinical Trials (KKS), Germany 2. Department of Surgery, Kreiskrankenhaus Tirschenreuth, Germany 3. University of London, London School of Hygiene and Tropical Medicine (LSHTM), UK 4. University of Heidelberg, Medical Faculty, Study Centre of the German Surgical Society (SDGC), Germany
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