Department of Operative Dentistry and Periodontology, Faculty of Medicine, Center for Dental Medicine, Medical Center, University of Freiburg, Freiburg i. Br., Germany; Faculty of Medicine and Dentistry, Danube Private University, 3500 Krems, Austria
Maya Doychinova
Department of Conservative Dentistry and Oral Pathology, Faculty of Dental Medicine, Medical University of Varna, Bulgaria