S. I. Ivanov
Clinical Hospital of the Presidential Administration of the Russian Federation; 45, bldg. 2, Losinoostrovskaya str., 107150 Moscow, Russian Federation
Russian Federation

Sergey I. Ivanov – Cand. of Sci. (Med.), doctor of Department of Cardiology, Clinical Hospital of the Presidential Administration of the Russian Federation, Moscow.

S. P. Leschinskaya
Russian University Of Medicine of the Ministry of Healthcare of the Russian Federation (former “A.I. Yevdokimov Moscow State University of Medicine and Dentistry”); 20/1, Delegatskaya str., Moscow 127473, Russian Federation
Russian Federation

Svetlana P. Leschinskaya — student of Russian University Of Medicine of the Ministry of health of the Russian Federation , Moscow.

M. N. Alekhin
Central State Medical Academy of the Presidential Administration of the Russian Federation; 19-1A, Marshal Timoshenko str., Moscow 121359, Russian Federation Central Clinical Hospital of the Presidential Administration of the Russian Federation; 15, Marshal Timoshenko str., Moscow 121359, Russian Federation
Russian Federation

Mikhail N. Alekhin – Doct. of Sci. (Med.), Professor, Head of Functional Diagnostics Department, Central Clinical Hospital of the Presidential Administration of the Russian Federation;
Professor, Division of Therapy, Cardiology, Functional Diagnostics, and Nephrology, Central State Medical Academy of the Presidential Administration of the Russian Federation, Moscow.