1. King Saud University College of Dentistry Riyadh Saudi Arabia
2. Department of Oral Medicine and Diagnostic Sciences, Division of Oral MedicineKing Saud University, College of Dentistry Riyadh Saudi Arabia
3. Department of Oral Medicine and Diagnostic Sciences, Division of Oral Biology/Microbiology/Pathology King Saud University, College of Dentistry Riyadh Saudi Arabia