1. Department of Oral and Maxillofacial Surgery, Friedrich- Alexander University of Erlangen/Nuremberg, Glückstrasse 11, 91054, Erlangen, Germany
2. Department of Oral and Maxillofacial Surgery, Gazi University, School of Dentistry, Emek 8.Cadde, 82.sokak, No:4, 06510, Ankara, Turkey
3. Department of Oral and Maxillofacial Surgery, University of Athens Medical School, Attikon Hospital, Rimini 1, GR 12462, Greece