1. Department of Oral Diagnostic Sciences, Faculty of Dentistry, King Abdulaziz University, Jeddah, Saudi Arabia
2. Faculty of Dentistry, Alexandria University, Alexadria, Egypt
3. Department of Oral Biology, Faculty of Dentistry, Damanhour University, Damanhour, Egypt
4. Department of Oral Biology, King Abdulaziz University, Faculty of Dentistry, Jeddah, Saudi Arabia