1. Voskresensk Dental Polyclinic
2. Ural State Medical University, Ministry of Health of Russia, Yekaterinburg
3. Penza Institute for Postgraduate Training of Physicians, Branch, Russian Medical Academy of Continuing Professional Education, Ministry of Health of Russia
4. Penza State University
5. Penza State Agrarian University
6. Acad. I.P. Pavlov Ryazan State Medical University