1. Department of Internal Medicine, University of New Mexico School of Medicine, Albuquerque, New Mexico, USA
2. Black Lung Program, Miners Colfax Medical Center, Raton, New Mexico, USA
3. COPD Program, Lovelace Respiratory Research Institute, Albuquerque, New Mexico, USA
4. Department of Internal Medicine, Brigham and Women’s Hospital, Boston, Massachusetts, USA
5. Department of Family and Community Medicine, University of New Mexico School of Medicine, Albuquerque, New Mexico, USA
6. Department of Internal Medicine, Washington University in St. Louis, St. Louis, Missouri, USA
7. Department of Epidemiology, University of Colorado School of Public Health, Aurora, Colorado, USA
8. PhD Program, University of Utah College of Nursing, Salt Lake City, Utah, USA