[1] Univ Roma La Sapienza, Dept Cardiovasc Resp Nephrol Anesthesiol & Geriat, Policlin Umberto Primo, Viale Policlin, Rome, Italy
[2] IRCCS ISMETT Ist Mediterraneo Trapianti & Terapie, Dept Anesthesia & Intens Care, Via Ernesto Tricomi, Palermo, Italy
[3] Bethel Fdn, Protestant Hosp, Dept Anesthesiol Intens Care Emergency Med Transf, Bielefeld, Germany
[4] Univ Hosp Muenster, Dept Anesthesiol Intens Care & Pain Med, Albert Schweitzer Campus 1, Munster, Germany