1. 1Department of Oral Medicine and Maxillofacial Radiology, Faculty of Dental Medicine, Lebanese University, Beirut, Lebanon .
2. 2Department of Restorative and Esthetic Dentistry, Faculty of Dental Medicine, Saint Joseph University, Beirut, Lebanon .
3. 3Department of Prosthodontics, Faculty of Dental Medicine, Saint Joseph University, Beirut, Lebanon .
4. 4Department of Periodontology, Faculty of Dental Medicine, Lebanese University, Beirut, Lebanon .
5. 5Department of Ophthalmology, Cantonal Hospital, Winthertur, Switzerland .