1. Ministry of Health (SCFHS), Prosthodontics Program (Training Center: Department of Restorative and Prosthetic Dental Sciences, College of Dentistry, Dar Al Uloom University), Riyadh, Saudi Arabia
2. Department of Restorative and Prosthetic Dental Sciences, School of Dentistry, Dar Al-Uloom University, Riyadh, Saudi Arabia
3. Department of Prosthodontics, School of Dentistry, Ibb University, Yemen
4. Department of Preventive Dental Sciences, College of Dentistry, Prince Sattam Bin Abdulaziz University, Alkharj, Saudi Arabia
5. Department of Preventive Dental Science, Dar Al Uloom University, Riyadh, Saudi Arabia