1. Department of Periodontology, School of Dental Medicine, University of Belgrade, Dr Subotica 4, Belgrade, Serbia
2. Institute of Rheumatology, School of Medicine, University of Belgrade, Resavska 69, Belgrade, Serbia
3. General and Oral Biochemistry, School of Dental Medicine, University of Belgrade, Dr Subotica 4, Belgrade, Serbia
4. Biomedical Statistics and Informatics, School of Dental Medicine, University of Belgrade, Dr Subotica 4, Belgrade, Serbia