1. Anaesthetic Department, Addenbrooke’s Hospital, Cambridge CB2 0QQ, UK
2. 2nd Department of Anesthesiology and Intensive Care, Medical University of Warsaw, 02-097 Warsaw, Poland
3. Department of Mechanical and Aerospace Engineering, “Sapienza” University of Rome, 00184 Rome, Italy
4. Department of Anesthesiology and Surgical-Trauma Intensive Care, Hospital Clínic Universitari de Valencia, University of Valencia, 46010 Valencia, Spain
5. Department of Anesthesiology, Critical Care and Pain Medicine, Policlinico Umberto I, “Sapienza” University of Rome, 00185 Rome, Italy