[1] Citta Castello Hosp, Sect Anesthesia Intens Care & Pain Med, Perugia, Italy
[2] Osped Gen Provinciale M Bufalini, Sect Anesthesia & Intens Care, AUSL Romagna, Cesena, Forli Cesena, Italy
[3] Citta Castello Hosp, Dept Surg, Breast Unit, Perugia, Italy
[4] Univ Perugia, Dept Surg & Biomed Sci, Sect Anesthesia Analgesia & Intens Care, Perugia, Italy
[5] San Salvatore Hosp, Sect Anesthesia Intens Care & Pain Med, Laquila, Italy
[6] St Maria Misericordia Hosp, Sect Anesthesia Intens Care & Pain Med, Perugia, Italy
[7] Osped Gen Provinciale M Bufalini, Anesthesia & Intens Care Unit, Azienda Romagna, Viale Ghirotti 286, I-47521 Cesena, FC, Italy