1. Dental Surgery Department, Wroclaw Medical University, 50-425 Wroclaw, Poland
2. Department of Dental Sciences, Faculty of Medicine, University of Liege, 4000 Liege, Belgium
3. Department of Endodontics, Dental Specialist’ DS Polyclinics, Saida 1600, Lebanon
4. Department of Periodontology, Faculty of Dental Medicine, Lebanese University, Beirut 6573/14, Lebanon
5. Department of Orthopedics, Heidelberg University Hospital, 69120 Heidelberg, Germany