1. Department of Clinical-Surgical, Diagnostic and Pediatric Sciences, University of Pavia , Pavia , Italy
2. Intensive Care Department, Intensive Care Fondazione Policlinico San Matteo Hospital IRCCS , Pavia , Italy
3. Department of Emergency Medicine, Department of Critical Care Medicine , Georgetown, Washington, DC , USA
4. MedStar Washington Hospital Center, University School of Medicine , 110 Irving Street NW, Washington, DC 20010 , USA
5. Santa Cabrini Hospital Ospedale, CEMTL , 5655 Rue Saint-Zotique E, Montreal, Quebec H1T 1P7 , Canada
6. Department of Adult Intensive Care, Royal Brompton Hospital , Sydney St, London SW3 6N , UK
7. Department of Surgical, Medical, Molecular Pathology and Critical Care Medicine, University of Pisa , VIa Paradisa 2, Pisa , Italy