G.I. SULTANOVA, Yu.G. KOCHNEVA, G.Kh. IBRAGIMOVA Children’s Republican Clinical Hospital of the Ministry of Health of the Republic of Tatarstan, 140 Orenburgskiy Trakt, Kazan, Russian Federation, 420138  Sultanova G.I. — cardiologist of the cardiac surgery department, tel. (843) 237-30-10, e-mail: [email protected] Kochneva Yu.G. — Head of the Department of Functional Diagnostics, tel. (843) 867-84-37 e-mail: […]