TY JOUR TI Potential Possibilities of Nuclear Medicine Methods in Diagnostics Age Changes of the Cardiovascular System. KW nuclear cardiology KW radionuclide diagnostics KW age changes KW cardiovascular system KW positron emission tomography JO Medical Radiology and radiation safety AU Vorontsova, M.V. AU Obrezan, A.A. AU Obrezan, A.G. PY 2021 IS 66 PB Federal Medical Biological Agency of Russia