D.R. TAVKAEVA, S.D. MAYANSKAYA Kazan State Medical Academy, 49 Butlerov St., Kazan, Russian Federation, 420012 Tavkaeva D.R. — postgraduate student of the Department of cardiology, X-ray endovascular and cardiovascular surgery, tel. +7-905-317-81-30, e-mail: dylyara@mail.ru Mayanskaya S.D. — D. Med. Sc., Professor of the Department of cardiology, X-ray endovascular and cardiovascular surgery, tel. +7-905-316-99-66, e-mail: Smayanskaya@mail.ru […]