1. Division of Restorative Dentistry, College of Dentistry, University of Kentucky, Lexington, Ken.
2. Institute of Dentistry, School of Medicine, Medical Sciences and Nutrition, University of Aberdeen, Aberdeen, Scotland, United Kingdom.
3. Division of Orthodontics, College of Dentistry, University of Kentucky, Lexington, Ken.
4. Division of Periodontology, College of Dentistry, University of Kentucky, Lexington, Ken.