1. Department of Operative Dentistry, School of Dentistry; University of North Carolina; Chapel Hill NC
2. Department of Conservative Dentistry; University of Jordan; Amman Jordan
3. Department of Restorative Dentistry; Universite de Montreal; Montreal Quebec Canada
4. Odum Institute; University of North Carolina; Chapel Hill NC
5. Department of Operative Dentistry; University of North Carolina; Chapel Hill NC