1. Department of Environmental and Radiological Health Sciences, Colorado State University, Fort Collins, Colorado;
2. Department of Epidemiology, Colorado School of Public Health, Aurora, Colorado;
3. Department of Statistics, Colorado State University, Fort Collins, Colorado;
4. Department of Surgery, University of Colorado School of Medicine, Aurora, Colorado;
5. Department of Cell Biology, University of Oklahoma Health Science Campus, Oklahoma City, Oklahoma;
6. Department of Internal Medicine, University of Nebraska Medical Center, Omaha, Nebraska;
7. Department of Occupational and Environmental Health, University of Iowa, Iowa City, Iowa;
8. Department of Environmental and Occupational Health, Colorado School of Public Health, Denver, Colorado;
9. High Plains Intermountain Center for Agricultural Health and Safety, Colorado State University, Fort Collins, Colorado