1. Department of Surgery, Policlinico Universitario ‘A.Gemelli’, Roma - Italy
2. Department of Anesthesia and Intensive Care, Ospedale Civile di Varese, Varese - Italy
3. Department of Anesthesia and Intensive Care, Ospedale Castelnuovo Monti, Reggio Emilia - Italy
4. Department of Surgery, Ospedali Riuniti di Cremona, Cremona - Italy
5. Department of Anesthesia and Intensive Care, Ospedale Civile di Bolzano, Bolzano - Italy
6. Department of Anesthesia and Intensive Care, Az. Osp. Universitaria di Pisa, Pisa - Italy
7. Department of Anesthesia and Intensive Care, Ospedale Careggi, Firenze - Italy
8. Department of Anesthesia and Intensive Care, Ospedale Fracastoro, San Bonifacio - Italy