1. Division of Pulmonary, Allergy, and Critical Care, Department of Medicine, Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania
2. Division of Pulmonary, Critical Care and Sleep Medicine, Department of Medicine, NYU School of Medicine, New York, New York
3. Section of Interventional Pulmonology and Thoracic Oncology, Division of Pulmonary, Allergy, and Critical Care, Department of Medicine, Perelman School of Medicine of the University of Pennsylvania, Philadelphia, Pennsylvania