N.A. TROEGUBOVA1, N.V. RYLOVA1, R.R. GILMUTDINOV2 1Kazan State Medical University, 49 Butlerov St., Kazan, Russian Federation, 420012 2Central Research Institute for Geology of Industrial Minerals, 4 Zinin St., Kazan, Russian Federation, 420097 Troegubova N.A. — postgraduate student of the Department of Hospital Pediatrics with a course of PP and PAE, tel. +7-905-376-29-79, e-mail: [email protected] Rylova […]