I.E. IVANOVA1, M.S. AGANDEEVA1, V.A. RODIONOV2 1Postgraduate Doctors’ Training Institute, 3 Krasnaya Sq., Cheboksary, Russian Federation, 428032 2Chuvash State University named after I.N. Ulyanov, 15 Moscow av., Cheboksary, Russian Federation, 428000  Ivanova I.E. — D. Med. Sc., Professor, Head of Pediatrics Department, tel. (8352) 53-00-10, e-mail: ivanova_57@list.ru Agandeeva M.S. — external PhD student of Pediatrics […]