1. Faculty of General Medicine, Carol Davila University of Medicine and Pharmacy, Eroilor Sanitari No. 8, 050474 Bucharest, Romania
2. Department of Engineering and Management of Technological Systems, Faculty of Mechanics, University of Craiova, 200512 Craiova, Romania
3. Faculty of Materials Science and Engineering, University Politehnica of Bucharest, 060042 Bucharest, Romania
4. Department of Dental Materials, Faculty of Dental Medicine, University of Medicine and Pharmacy of Craiova, 200638 Craiova, Romania