1. Department of Prosthetic Dental Sciences, College of Dentistry, King Saud University, Riyadh, Saudi Arabia;
2. Ministry of Interior Medical Services, Security Forces Hospital Program, Riyadh, Saudi Arabia;
3. Department of Oral and Maxillofacial Prosthodontics, King Abdulaziz University, Jeddah, Saudi Arabia;
4. Department of Prosthodontics, College of Dentistry, Princess Nourah Bint Abdulrahman University, Riyadh, Saudi Arabia;
5. Department of Periodontology, Faculty of Dentistry, Ziauddin University, Karachi, Pakistan;
6. Department of General Dentistry, Eastman Institute for Oral Health, University of Rochester, Rochester, NY, USA