1. Hirslanden Clinique des Grangettes Division of Critical Care Medicine, , Geneva, Switzerland
2. University Hospitals of Geneva Division of Anesthesiology, , Geneva, Switzerland
3. Hirslanden Clinique des Grangettes Division of Infectiology, , Geneva, Switzerland
4. Hirslanden Clinique des Grangettes Division of Surgery, , Geneva, Switzerland
5. University of Fribourg Surgical Research Unit, , Fribourg, Switzerland