1. Division of Pulmonary, Allergy, and Critical Care Medicine, Department of Medicine, Dorothy P. and Richard P. Simmons Center for Interstitial Lung Disease, and
2. Department of Human Genetics, Graduate School of Public Health, University of Pittsburgh, Pittsburgh, Pennsylvania;
3. Department of Medicine, Clinician Investigator Program, and
4. Division of Pulmonary, Critical Care and Sleep Medicine, Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts;
5. Division of Respiratory Medicine, Department of Medicine, University of British Columbia, Vancouver, British Columbia, Canada; and
6. Air Pollution Exposure Laboratory, Vancouver Coastal Health Research Institute, Vancouver, British Columbia, Canada