Z.А. GRIGORJEVA 1, N.Kh. ZHAMLIKHANOV1,2, A.G. FYODOROV1 1Chuvash State University named after I.N. Ulyanov, 15 Moskovskiy Ave., Cheboksary, Russian Federation, 428015 2City Children’s Hospital No. 3 of the Ministry of Health of the Chuvash Republic, 12 Traktorostroiteley Ave., Cheboksary, Russian Federation, 428000 Contact details:  Grigorjeva Z.A. —  Head of the Department for organization of medical […]