1. Department of Oral Medicine and Diagnostic SciencesAl‐Farabi Colleges Riyadh Saudi Arabia
2. Department of Oral MedicineSana'a University Sana'a Yemen
3. Department of Oral MedicineKing's College London UK
4. World Health Organization Collaborating Centre for Oral Cancer London UK
5. Department of Restorative and Prosthetic Dental SciencesDar Al Uloom University Riyadh Saudi Arabia
6. Department of Fixed ProsthodonticsIbb University Ibb Yemen