1 Department of Respiratory, Hospital Ramón y Cajal (IRYCIS), Madrid, Spain.
2 Department of Medicine, Universidad de Alcalá (IRYCIS), Madrid, Spain.
3 Division of Cardiology, Department of Medicine, Columbia University Medical Center, New York-Presbyterian Hospital, New York, New York, United States.
4 Center for Outcomes Research and Evaluation (CORE), Yale University School of Medicine, New Haven, Connecticut, United States.
5 Department of Internal Medicine, Hospital Universitari Germans Trias i Pujol, Badalona, Barcelona, Spain.
6 Universidad Católica de Murcia, Murcia, Spain.
7 Division of Pulmonary and Critical Care Medicine, Washington University School of Medicine, St. Louis, Missouri, United States.
8 Division of General Medical Sciences, Washington University School of Medicine, St. Louis, Missouri, United States.