[1] Univ Texas Hlth Sci Ctr San Antonio, Anesthesiol, San Antonio, TX 78229 USA
[2] Univ Texas Hlth Sci Ctr San Antonio, Pulm Crit Care, San Antonio, TX USA
[3] Hosp Univ Getafe, Madrid, Spain
[4] CIBER Enfermedades Resp, Madrid, Spain
[5] Univ Hosp Poitiers, Poitiers, France
[6] Hosp Nacl Alejandro Posadas, Buenos Aires, DF, Argentina
[7] Hannover Med Sch, Hannover, Germany
[8] Clin Medellin, Medellin, Colombia
[9] Univ Pontificia Bolivariana, Medellin, Colombia
[10] Peking Union Med Coll Hosp, Beijing, Peoples R China
[11] Bombay Hosp & Med Res Ctr, Inst Med Sci, Mumbai, Maharashtra, India
[12] Hosp Fattouma Bourguina, Monastir, Tunisia