1. Division of Thoracic Surgery and Interventional Pulmonology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts
2. Section of Interventional Pulmonology, Division of Pulmonary and Critical Care Medicine, Johns Hopkins University, Baltimore, Maryland
3. Chicago Chest Center, Elk Grove Village, Illinois
4. Division of Pulmonary, Critical Care, Sleep and Allergy, University of Illinois at Chicago, Chicago, Illinois