1. King Saud University Medical City, College of Medicine, King Saud University, Riyadh, Saudi Arabia;
2. Princess Nourah bint Abdulrahman University, Riyadh, Saudi Arabia;
3. Department of Restorative Dental Science, College of Dentistry, King Saud University & College of Dentistry Princess Nourah bint AbdulRahman University, Riyadh, Saudi Arabia;
4. King Abdulaziz University, Jeddah, Saudi Arabia;
5. Swansea University, Swansea, United Kingdom