1. Department of Conservative Dentistry and Periodontology, University Hospital, Ludwig-Maximilians University, Goethestrasse 70, D-80336 Munich, Germany
2. Oral Microbiology and Biomaterials Laboratory, Department of Biomedical, Surgical and Dental Sciences, Università Degli Studi di Milano, Via Pascal, 36, 20133 Milano, Italy
3. Institute of Chemistry Raluca Ripan, Babes-Bolyai University, 30 Fantanele St., 400294 Cluj-Napoca, Romania