1. Department of Dental Sciences, Faculty of Medicine, University of Liège, Liège, Belgium.
2. Department of Oral and Maxillo-Facial Surgery, Faculty of Dentistry, Lebanese University, Beirut, and Rafic Hariri university, Hadath, Lebanon.
3. Unit of Oral Pathology and Medicine and Laser-assisted Oral Surgery, Department of ENT/Dental/Ophthalmological and Cervico-Facial Sciences, Faculty of Medicine and Surgery, University of Parma, Parma, Italy.