1. Division of Periodontology College of Dentistry University of Kentucky Lexington Kentucky USA
2. Biostatistics, College of Public Health University of Kentucky Lexington Kentucky USA
3. Division of Orthodontics, College of Dentistry University of Kentucky Lexington Kentucky USA
4. Department of Periodontology Dublin School of Dentistry Dublin Ireland
5. Department of Periodontology College of Dentistry University of Florida Gainesville Kentucky USA
6. Statistics, College of Arts and Science University of Kentucky Lexington Kentucky USA
7. Division of Periodontology and Center for Oral Health Research College of Dentistry University of Kentucky Lexington Kentucky USA