[1] Fdn Policlin Univ A Gemelli IRCCS, Dept Anesthesiol Intens Care & Emergency Med, Rome, Italy
[2] Univ Cattolica Sacro Cuore, Rome, Italy
[3] St James Hosp, Dept Intens Care Med, MICRO, St James St, Dublin 8, Ireland
[4] Univ Barcelona, Hosp Clin, IDIBAPS, Barcelona, Spain
[5] Natl & Kapodistrian Univ Athens, ATTIKON Univ Hosp, Med Sch, Crit Care Dept, Athens, Greece
[6] Fdn Policlin Univ A Gemelli IRCCS, Dept Internal Med & Gastroenterol, Rome, Italy