1 Respiratory Medicine, Ramón y Cajal Hospital (IRYCIS), and CIBER Enfermedades Respiratorias (CIBERES), Madrid, Spain.
2 Department of Thoracic Medicine and Surgery, Lewis Katz School of Medicine, Temple University, Philadelphia, PA. Electronic address: parth.rali@tuhs.temple.edu.
3 Pulmonary, Critical Care, and Occupational Medicine, University of Iowa, Iowa City, IA.