[1] Azienda Osped Univ Citta Salute & Sci, Dept Anesthesia & Intens Care, I-10126 Turin, Italy
[2] Univ Bologna, Alma Mater Studiorum, St Orsola Malpighi Hosp, Dept Specialist Diagnost & Expt Med DIMES,Resp &, I-40126 Bologna, Italy
[3] Univ Palermo, Dept Biopathol Med & Forens Biotechnol DIBIMEF, Sect Anesthesiol Analgesia Emergency & Intens Car, Policlin P Giaccone, Palermo, Italy
[4] Univ Roma La Sapienza, Osped Policlin Umberto 1, Dept Anesthesia & Intens Care, I-00161 Rome, Italy