[1] Hosp Santa Creu & Sant Pau, Serv Med Intensiva, Barcelona, Spain
[2] Univ Barcelona, Programa Doctorado Med, Barcelona, Spain
[3] Hosp Tortosa Verge Cinta, Serv Med Intensiva, Tarragona, Spain
[4] Hosp Santa Creu & Sant Pau, Unidad Cuidados Criticos Postquirurgicos, Barcelona, Spain
[5] Hosp Santa Creu & Sant Pau, Serv Anestesiol, Barcelona, Spain
[6] Hosp Santa Creu & Sant Pau, IIB, Dept Epidemiol Clin & Salud Publ, Barcelona, Spain
[7] Univ Autonoma Barcelona, Consorcio Invest Biomed Epidemiol & Salud Publ CI, E-08193 Barcelona, Spain
[8] Univ Pompeu Fabra, Dept Ciencias Expt & Salud, Barcelona, Spain