1 Department of Anaesthesia and Intensive Care, A.O.U. Policlinico-San Marco, Site "Policlinico G. Rodolico", Via S. Sofia N 78, 95123, Catania, Italy.
2 Division of Critical Care Medicine, Department of Medicine, The Queen's Medical Center, Honululu, HI, USA.
3 Department of Critical Care Medicine, Respiratory Institute, Cleveland Clinic, Cleveland, OH, USA.
4 Cleveland Clinic Lerner College of Medicine, Cleveland, OH, USA.
5 Department of Anaesthesia and Intensive Care, A.O.U. Policlinico-San Marco, Site "Policlinico G. Rodolico", Via S. Sofia N 78, 95123, Catania, Italy. filipposanfi@yahoo.it.
6 Department of General Surgery and Medical-Surgical Specialties, Section of Anesthesia and Intensive Care, University of Catania, Catania, Italy. filipposanfi@yahoo.it.