1. Experimental Medicine, University of Pavia, 27100 Pavia, Italy
2. Adult Intensive Care Unit, Royal Brompton Hospital, London SW3 6NP, UK
3. Unit of Anesthesia and Intensive Care, Department of Clinical-Surgical, Diagnostic and Pediatric Sciences, University of Pavia, 27100 Pavia, Italy
4. Anesthesia and Intensive Care, Fondazione IRCCS Policlinico San Matteo, 27100 Pavia, Italy
5. Clinical Chemistry Laboratory, Department of Molecular Medicine, Fondazione IRCCS Policlinico San Matteo, 27100 Pavia, Italy
6. Department of Surgical, Medical and Molecular Pathology and Critical Care Medicine, University of Pisa, 56126 Pisa, Italy