1. ENT-Clinic, University Hospital Mainz, Mainz, Germany
2. Laboratory of Histology-Embryology, School of Medicine, Faculty of Health Sciences, Aristotle University of Thessaloniki, Thessaloniki, Greece
3. Laboratory for Clinical Pharmacology, School of Medicine, Faculty of Health Sciences Aristotle University Thessaloniki, Thessaloniki, Greece
4. Department of Oral Medicine/Pathology, School of Dentistry, Faculty of Health Sciences, Aristotle University of Thessaloniki, Thessaloniki, Greece