1. Department of Visceral Surgery, Lausanne University Hospital CHUV, University of Lausanne (UNIL), 1005 Lausanne, Switzerland
2. Division of Colon and Rectal Surgery, Department of Surgery, Mayo Clinic, 200 First Street SW, Rochester, MN 55905, USA
3. Department of Anesthesiology, Lausanne University Hospital CHUV, University of Lausanne (UNIL), 1005 Lausanne, Switzerland