1. Jędrzej Śniadecki Academy of Physical Education and Sport, Gdańsk, Poland.
2. Jędrzej Śniadecki Academy of Physical Education and Sport, Gdańsk, Poland
3. Department of Microbiology and Biochemistry, University of Fort Hare, Alice, South Africa.
4. Department of Theory of Sports Training, Academy of Physical Education in Katowice, Poland.