Prof. Dr. med. Dr.med. dent. H. Eufinger, Klinikum Vest Clinic for Oral and Maxillofacial Surgery and Plastic Surgery, Treatment Center Knappschaftskrankenhaus RecklinghausenProf. Dr. Dr. A. Kübler, Clinic and Polyclinic for Oral and Maxillofacial Surgery and Plastic Surgery, University Hospital WürzburgProf. Dr. Dr. H.Schliephake, Department of Oral and Maxillofacial Surgery, University Medical Center Göttingen