Letters to the Editor: Methods to increase clinical applicability of heart rate variability analysis for noninvasive detecting severity of coronary lesions in patients with coronary heart disease

Kiselev, Anton R. Saratov State Medical University - Research Institute of Cardiology, Russia , Kiselev, Anton R. Bakulev Scientific Center for Cardiovascular Surgery, Russia , Shvartz, Vladimir A. Bakulev Scientific Center for Cardiovascular Surgery, Russia , Karavaev, Anatoly S. Saratov State University, Russia , Prokhorov, Mikhail D. Institute of Radio Engineering and Electronics of Saratov Branch, Russia

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