1. Department of Physical Education and Sport, Wroclaw Medical University, 51-601 Wroclaw, Poland
2. Student Scientific Association, Department of Physical Education and Sport, Wroclaw Medical University, 51-601 Wroclaw, Poland
3. Warsaw University of Life Sciences, Institute of Economics and Finance, Nowoursynowska 166, 02-787 Warsaw, Poland
4. Department of Econometrics and Statistics, Warsaw University of Life Sciences, Institute of Economics and Finance, Nowoursynowska 166, 02-787 Warsaw, Poland
5. Faculty of Agriculture and Economics, University of Agriculture in Krakow, 31-120 Krakow, Poland