[1] Cleveland Clin, Anesthesiol Inst, Outcomes Res Dept, Cleveland, OH 44106 USA
[2] Istanbul Univ Cerrahpasa, Dept Anesthesiol & Reanimat, Cerrahpasa Med Fac, Istanbul, Turkey
[3] Univ Hosp AOU Careggi, Dept Clin & Expt Med, Florence, Italy
[4] Hosp Univ 12 Octubre, Dept Anesthesia, Madrid, Spain
[5] Hosp Interzonal Gen Dr Jose Penna, Dept Anesthesiol, Bahia Blanca, Buenos Aires, Argentina
[6] Mostoles Univ Hosp, Dept Anesthesia & Crit Care, Madrid, Spain
[7] Hosp Mexico Costa Rica, Dept Anesthesiol, San Jose, Costa Rica
[8] Inst Portugues Oncol Porto Francisco Gentil, Dept Anesthesia, Porto, Portugal
[9] Univ Autonoma Madrid, Sch Med, Dept Anat Histol & Neurosci, Madrid, Spain
[10] Univ Mostoles, Dept Anesthesia Hosp, Madrid, Spain