Karim Bendjelid1, Bruno Levy2, Alain Broccard3. 1. Geneva Medical School, 1211 Geneva, Switzerland ; Intensive Care Service, Geneva University Hospitals, Geneva Medical School, 1211 Geneva, Switzerland. 2. Service de Réanimation Médicale Brabois, Vandoeuvre lès Nancy, France. 3. University of Minnesota, Regions Hospital Pulmonary and Critical Care Division, 640 Jackson Street, St. Paul, MN 55455, USA.