1. Restorative and Prosthetic Dental Sciences Department College of Dentistry King Saud bin Abdulaziz University for Health Sciences Riyadh Saudi Arabia
2. King Abdullah International Medical Research Centre Ministry of National Guard Health Affairs Riyadh Saudi Arabia
3. Department of Restorative Sciences School of Dentistry Birmingham Alabama USA
4. Department of Restorative Dentistry School of Dental Medicine University at Buffalo Buffalo New York USA
5. Department of Reconstructive Dentistry and Gerodontology School of Dental Medicine University of Bern Bern Switzerland