1. Department of Physiology, School of Medicine in Katowice, Medical University of Silesia, 40‑752 Katowice, Poland
2. Department of Internal Medicine and Clinical Pharmacology, School of Medicine in Katowice, Medical University of Silesia, 40‑752 Katowice, Poland
3. Department of Magnetic Resonance Imaging, Institute of Nuclear Physics Polish Academy of Sciences, 31‑342 Krak?w, Poland