I.S. GRISHIN1, N.I. MAKSIMOV1, N.S. GRISHINA2  1Izhevsk State Medical Academy, Izhevsk 2Republican Clinical and Diagnostic Center, Izhevsk Contact details: Grishin I.S. — Assistant Lecturer, Department of State Medicine with a course in Cardiology and functional diagnostics Address: 281 Kommunarov St., Izhevsk, Russian Federation, 426034, tel.: +7-912-020-01-96, e–mail: V9120200196@yandex.ru List of abbreviations: GFI — global function […]