[1] Anesthesiol Inst, Dept Gen Anesthesia & Pain Management, Outcomes Res, Cleveland, OH 44195 USA
[2] Case Western Reserve Univ, Cleveland Clin, CCLCM, Cleveland, OH 44106 USA
[3] Ataturk Univ, Sch Med, Dept Anesthesiol & Reanimat, Erzurum, Turkey
[4] Cleveland Clin, Inst Anesthesiol, Outcomes Res Dept, Cleveland, OH 44106 USA
[5] Ataturk Univ, Anesthesiol Clin Res Off, Erzurum, Turkey
[6] Cleveland Clin, Dept Reg Anesthesia & Acute Pain Management, Cleveland, OH 44106 USA
[7] Univ Hosp Virgen de la Arrixaca, Nesthesia Intens Care & Chron Pain Treatment, Murcia, Spain