1. Division of Operative Dentistry, Department of General Dentistry University of Tennessee Health Science Center College of Dentistry Memphis Tennessee USA
2. Department of Operative Dentistry Aichi Gakuin University School of Dentistry Nagoya Japan
3. Department of Operative Dentistry College of Dentistry, University of Iowa Iowa City Iowa USA
4. Department of General Dentistry School of Dentistry, Creighton University Omaha Nebraska USA
5. Division of Dental Biomaterials, Department of Restorative Sciences University of Alabama at Birmingham School of Dentistry Birmingham Alabama USA
6. Temple University Kornberg School of Dentistry Philadelphia Pennsylvania USA
7. Department of Periodontology and Community Dentsitry College of Dentistry, King Saud University Riyadh Saudi Arabia
8. Department of Prosthetic Dental Sciences College of Dentistry, King Saud University Riyadh Saudi Arabia
9. Department of Dental Health College of Applied Medical Sciences, King Saud University Riyadh Saudi Arabia