1. Centers for Disease Control and Prevention, Ft. Collins, Colorado, USA
2. Utah Department of Health, Salt Lake City, Utah, USA
3. Centers for Disease Control and Prevention, Atlanta, Georgia, USA
4. TriCounty Health Department, Vernal, Utah, USA
5. Utah Department of Health, Salt Lake City, Utah, USACenters for Disease Control and Prevention, Atlanta, Georgia, USA
6. University of Arizona, Tucson, Arizona, USA