E.V. PSHENICHNAYA1, N.N. KONOPKO2, N.A. TONKIKH1 1 Donetsk National Medical University named after M. Gorkiy, 16 Prospekt Ilyicha, Donetsk, Ukraine, 83003 2 Tver State Medical University, 4 Sovetskaya Str., Tver, Russian Federation, 107100  Pshenichnaya E.V. ― Cand. Med. Sc., Associate Professor, Head of the Department of Pediatrics of the Faculty of Internship and Postgraduate Education, […]