1. Advanced Lung Disease and Lung Transplant Program, Inova Fairfax Hospital, Falls Church, Virginia;
2. Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, California;
3. Department of Pulmonary and Critical Care Medicine, College of Medicine, University of Cincinnati, Cincinnati, Ohio;
4. Division of Pulmonary and Critical Care Medicine, Department of Medicine, University of Arizona, Tucson, Arizona;
5. Pulmonary Medicine, Cleveland Clinic, Cleveland, Ohio;
6. Cardiology Section, University of California Los Angeles David Geffen School of Medicine, Los Angeles, California;
7. Division of Pulmonary Critical Care, VA Greater Los Angeles Healthcare System;
8. United Therapeutics Corporation, Research Triangle Park, North Carolina; and
9. Pulmonary and Critical Care Medicine, Brigham and Women’s Hospital, Boston, Massachusetts