1 CIBER de Enfermedades Respiratorias, Instituto de Salud Carlos III, Madrid, Spain.
2 Multidisciplinary Organ Dysfunction Evaluation Research Network (MODERN), Research Unit, Hospital Universitario Dr. Negrín, Las Palmas de Gran Canaria, Spain.
3 Keenan Research Center for Biomedical Science at the Li Ka Shing Knowledge Institute, St. Michael's Hospital, Toronto, ON, Canada.
4 Pulmonology Department University Hospital of Cattinara, Trieste, Italy.
5 Department of Anesthesiology and Critical Care Medicine, Memorial Sloan Kettering Cancer Center, New York, NY.
6 Division of Pulmonary, Critical Care, and Sleep Medicine, Department of Medicine, University of Tennessee Health Science Center, Memphis, TN.
7 Memphis Veterans Affairs Medical Center, Memphis, TN.