1. Department of Medicine, University of Colorado School of Medicine, Aurora, Colorado
2. Department of Epidemiology, Colorado School of Public Health, Aurora, Colorado
3. Center for Genes, Environment, and Health
4. Department of Medicine, and
5. Department of Biomedical Research, National Jewish Health, Denver, Colorado; and
6. Department of Biostatistics and Bioinformatics and
7. Department of Environmental and Occupational Health, Colorado School of Public Health, Aurora, Colorado