1. Boston Medical Center, 1836, Medicine, Boston, Massachusetts, United States;
2. Beth Israel Deaconess Medical Center, Department of Medicine, Boston, Massachusetts, United States
3. Beth Israel Deaconess Medical Center, Center for Healthcare Delivery Science, Boston, Massachusetts, United States
4. National Jewish Health, Division of Pulmonary, Critical Care, and Sleep Medicine, Department of Medicine, Denver, Colorado, United States
5. Denver, Colorado, United States
6. Beth Israel Deaconess Medical Center, Cardiology Division, Boston, Massachusetts, United States
7. Boston University School of Medicine, Pulmonary Center, Boston, Massachusetts, United States