1. Division of Pulmonary and Critical Care Medicine,
2. Division of Pulmonary and Critical Care Medicine and
3. Department of Biostatistics, and
4. Section of Pulmonary and Critical Care Medicine, University of Chicago, Chicago, Illinois;
5. Division of Pulmonary, Critical Care and Sleep Medicine, University of California, Davis, Sacramento, California;
6. Pulmonary Fibrosis Foundation, Chicago, Illinois;
7. Division of Pulmonary and Critical Care, University of Texas Southwestern, Dallas, Texas;
8. Division of Pulmonary and Critical Care, East Carolina University, Greenville, North Carolina;
9. School of Public Health Sciences, University of Virginia, Charlottesville, Virginia;
10. Division of Pulmonary Medicine, National Jewish Health, Denver, Colorado;
11. Medical Service, Veterans Affairs Ann Arbor Healthcare System, Ann Arbor, Michigan; and
12. Division of Pulmonary and Critical Care Medicine, Weill Cornell Medical Center, New York, New York
13. Department of Epidemiology, University of Michigan, Ann Arbor, Michigan;