1. University of Latvia, Department of Human and Animal Physiology, Faculty of Biology, Raina Boulevard 19, Riga LV-1586, Latvia
2. University of Latvia, Institute of Atomic Physics and Spectroscopy, Skunu Street 4, Riga LV-1586, Latvia
3. Hospital of Traumatology and Orthopaedics, Duntes Street 29, Riga LV-1005, Latvia