1. Department of Dental Medicine, Division of Periodontology, Karolinska Institutet, Huddinge, Sweden;
2. Department of Therapeutic Dentistry, Belarusian State Medical University, Minsk, Belarus;
3. Department of Microbiology, Virology and Immunology, Belarusian State Medical University, Minsk, Belarus;
4. Department of Dental Medicine, Division of Oral Facial Diagnostics and Surgery, Karolinska Institutet, Huddinge, Sweden