1. Clinical Infectious Diseases Hospital of Constanta, 900709 Constanța, Romania
2. Faculty of Dentistry, Ovidius University of Constanța, 900470 Constanta, Romania
3. Faculty of Medicine, Ovidius University of Constanța, 900470 Constanta, Romania
4. Doctoral School of Medicine, Ovidius University of Constanța, 900470 Constanta, Romania