1. Department of Geological Sciences Brigham Young University Provo UT USA
2. Department of Civil and Environmental Engineering Brigham Young University Provo UT USA
3. Center for Genes, Environment, and Health National Jewish Health Denver CO USA
4. Medicine and Academic Affairs National Jewish Health Denver CO USA
5. Division of Pulmonary Sciences and Critical Care Medicine University of Colorado Anschutz Medical Campus Aurora CO USA
6. Department of Medicine Rocky Mountain Regional Denver Veterans Affairs Medical Center Aurora CO USA