E.M. SPERANSKAYA1, L.I. NIKITINA1, N.N. GOLUBTSOVA1, L.R. MUKHAMEDZHANOVA1,2, R.G. KUZNETSOVA3 1Chuvash State University named after I.N. Ulyanov, 15 Moskovskiy Prospekt, Cheboksary, Russian Federation, 428015 2Educational and Methodological Center «Eksklyuziv-Dent», 42 Kosmonavtov St., Kazan, Russian Federation, 420099 3Republican Clinical Hospital of Ministry of Health of the Republic of Tatarstan, 138 Orenburgskiy Trakt, Kazan, Russian Federation, 420064  Speranskaya E.M. — 5-year student of the Medical Faculty, […]