1. Anesthesiology Department, Hospital of Fribourg, 1708 Fribourg, Switzerland
2. Anesthesiology and Intensive Care Department, Istituto Cardiocentro EOC, 6900 Lugano, Switzerland
3. Pneumology Department, University Hospital Lausanne, 1005 Lausanne, Switzerland
4. Anesthesiology Department, University of Valencia, 46010 València, Spain
5. Division of Anaesthesia, Department of Anaesthesiology, Clinical Pharmacology, Intensive Care and Emergency Medicine, Geneva University Hospitals, Faculty of Medicine, University of Geneva, 1205 Geneva, Switzerland
6. Anesthesiology Department, University Hospital Lausanne, 1005 Lausanne, Switzerland