1. Institute of Health Sciences, Pomeranian University in Slupsk, Westerplatte 64, 76-200 Slupsk, Poland
2. Institute of Physical Culture and Health, State Higher School of Vocational Education in Koszalin, Leśna 1, 75-582 Koszalin, Poland
3. Medical Department, Poznan University of Medical Sciences, Fredry 10, 61-701 Poznan, Poland