M. N. Alekhin
Central State Medical Academy of Department of Presidential Affairs, Central State Medical Academy of the Office of the President of the Russian Federation; Central Clinical Hospital of the Presidential Administration of the Russian Federation
Russian Federation

Mikhail N. Alekhin, Dr. Sci. (Med.), Honored Doctor of the Russian Federation, Professor, Department of Therapy, Cardiology and Functional Diagnostics with Nephrology Course; Head of Functional Diagnostics Department

19, stroenie 1А, Marshala Timoshenko str., Moscow, 121359, Russian Federation; 
15, Marshala Timoshenko str., Moscow, 121359, Russian Federation 

S. I. Ivanov
Central State Medical Academy of Department of Presidential Affairs, Central State Medical Academy of the Office of the President of the Russian Federation
Russian Federation

Sergey I. Ivanov, Graduate Student, Department of Therapy, Cardiology and Functional Diagnostics with Nephrology Course

19, stroenie 1А, Marshala Timoshenko str., Moscow, 121359, Russian Federation

N. F. Radova
Central State Medical Academy of Department of Presidential Affairs, Central State Medical Academy of the Office of the President of the Russian Federation; Central Clinical Hospital of the Presidential Administration of the Russian Federation
Russian Federation

Natalya F. Radova, Associate Professor, Department of Therapy, Cardiology and Functional Diagnostics with Nephrology Course; Doctor, Functional Diagnostics Department

19, stroenie 1А, Marshala Timoshenko str., Moscow, 121359, Russian Federation; 
15, Marshala Timoshenko str., Moscow, 121359, Russian Federation