1. Centre for Heart Diseases, 4th Military Hospital, 50-981 Wroclaw, Poland
2. Department of Physiology, Wroclaw Medical University, 50-367 Wroclaw, Poland
3. Institute of Heart Diseases, Wroclaw Medical University, 50-367 Wroclaw, Poland
4. Institute of Heart Diseases, University Hospital, 50-556 Wroclaw, Poland
5. Faculty of Medicine, Wroclaw University of Science and Technology, 51-377 Wroclaw, Poland
6. Faculty of Physiotherapy, Wroclaw University of Health and Sport Sciences, 51-612 Wroclaw, Poland