1. Department of Biomedical Technology, Faculty of Biomedical EngineeringCzech Technical University in Prague Kladno Czech Republic
2. Department of Cardiac Physiology, Institute of Physiology, Komi Science Center, Ural BranchRussian Academy of Sciences Syktyvkar Russia
3. Department of PhysiologyMedical Institute of Pitirim Sorokin Syktyvkar State University Syktyvkar Russia