I.E. IVANOVA1, V.A. RODIONOV1, 2 1Institute for Advanced Medical Studies of the Ministry of Healthcare of Chuvash Republic, Cheboksary 2City Children’s Clinical Hospital, Cheboksary  Contact details: Ivanova I.E. – MD, Head of the Pediatrics Department Address: 27 M. Sespel St., Cheboksary, Russian Federation, 428032, tel.: +7 (8352) 56-00-10, e-mail: [email protected] The paper presents the main […]