1. Department of Medicine and
2. Department of Medicine, Stanford University School of Medicine, Palo Alto, California
3. Department of Medicine, University of Colorado Health Sciences Center, Aurora, Colorado
4. Cardiovascular Institute, Allegheny General Hospital, Pittsburgh, Pennsylvania
5. Department of Medicine, Mayo Clinic Florida, Jacksonville, Florida
6. Department of Medicine, Washington University, St. Louis, Missouri
7. Department of Medicine, University of Cincinnati, Cincinnati, Ohio
8. Arizona Pulmonary Specialists, Phoenix, Arizona
9. Comprehensive Pulmonary Hypertension Center-University Medical Center, Louisiana State University, New Orleans, Louisiana
10. Department of Medicine, Johns Hopkins University, Baltimore, Maryland
11. Kentuckiana Pulmonary Research Center, Kentuckiana Pulmonary Associates, Louisville, Kentucky
12. Department of Medicine, Medical College of Wisconsin, Milwaukee, Wisconsin
13. The Oregon Clinic, Portland, Oregon
14. Cottage Pulmonary Hypertension Center, Cottage Health, Santa Barbara, California
15. Advanced Lung Disease and Lung Transplant Program, Inova Fairfax Medical Campus, Falls Church, Virginia
16. Department of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania; and
17. Department of Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania
18. Department of Epidemiology and Biostatistics, University of California, San Francisco School of Medicine, San Francisco, California