1. Division of General Internal Medicine,
2. University of Utah Health Thrombosis Service, University of Utah Medical Center,
3. Division of Pulmonary and Critical Care Medicine, and
4. Department of Atmospheric Sciences,
5. Department of City & Metropolitan Planning, and
6. Division of Epidemiology, Department of Internal Medicine, University of Utah School of Medicine,
7. Division of Public Health, Department of Family and Preventive Medicine, University of Utah, Salt Lake City, Utah