1. Department of Community and Behavioral Health, Colorado School of Public Health, University of Colorado Anschutz Medical Campus, Aurora, CO, USA
2. Community Dentistry and Population Health, School of Dental Medicine, University of Colorado Anschutz Medical Campus, Aurora, CO, USA
3. Department of Microbiology, School of Dental Medicine, University of Pennsylvania, Philadelphia, PA, USA
4. Consultant, Bethesda, MD, USA