1. Department of Periodontology, Faculty of Dental Medicine, Lebanese University, Beirut 27798, Lebanon
2. Department of Dental Sciences, Faculty of Medicine, University of Liege, 4000 Liege, Belgium
3. Department of Oral Medicine and Maxillofacial Radiology, Faculty of Dental Medicine, Lebanese University, Beirut 27798, Lebanon
4. Department of Oral and Maxillofacial Surgery, Faculty of Dental Medicine, Lebanese University, Beirut 27798, Lebanon