Inova Health System - Inova Fairfax Hospital, Harvard University - Brigham and Women's Hospital, Duke University - Medical Center, Piedmont Healthcare, Pulmonary Associates of Richmond, Mayo Clinic, University of Miami Health System, Houston Methodist Hospital, Inova Health System - Inova Fairfax Hospital, University of New Mexico, United Therapeutics Corporation, United Therapeutics Corporation, United Therapeutics Corporation, United Therapeutics Corporation and Cedars Sinai Medical Center - Department of Medicine

University of Cincinnati - Department of Internal Medicine, Houston Methodist Hospital, Inova Health System - Inova Fairfax Hospital, University of Tennessee Medical Center, Johns Hopkins University, University of New Mexico, Brown University - Warren Alpert Medical School, University of Texas Health Science Center at San Antonio, University of Cincinnati, Cleveland Clinic, Cardarelli Hospital, Poms Research Consultants, Spectrum Health, University of California, San Francisco (UCSF) - UCSF Medical Center, University of Massachusetts Worcester - UMass Chan Medical School, Mayo Clinic - Florida - Department of Pulmonary Medicine and University of Cincinnati