1. Department of Medicine, Warren Alpert School of Medicine at Brown University, Providence, RI, USA
2. Department of Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, USA
3. Department of Rehabilitation Medicine, University of Washington School of Medicine, Seattle, WA, USA
4. Department of Kinesiology, Health and Sport Sciences, University of Indianapolis, Indianapolis, IN, USA
5. Section of Advanced Heart Failure and Pulmonary Hypertension, Cardiovascular Division, University of Minnesota, Minneapolis, MN, USA
6. Department of Anesthesiology and Perioperative Medicine, David Geffen School of Medicine at UCLA, Los Angeles, CA, USA
7. Department of Health Services, Policy and Practice, Brown University, Providence, RI, USA
8. Department of Medicine, National Jewish Health, Denver, CO, USA
9. Department of Medicine, University of Colorado, Aurora, CO, USA
10. Department of Medicine, Rocky Mountain Regional Veterans Affairs Medical Center, Aurora, CO, USA