1. Division of Thoracic Surgery and Interventional Pulmonology, Beth Israel Deaconess Medical Center and
2. Department of Internal Medicine, UMass Memorial Medical Center, University of Massachusetts Medical School, Worcester, Massachusetts; and
3. Division of Pulmonary and Critical Care Medicine, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts
4. Division of Pulmonary and Critical Care Medicine, Mayo Clinic, Jacksonville, Florida