1. Department of Human Motor Behavior, The Jerzy Kukuczka Academy of Physical Education, Katowice, Poland
2. Department of Kinesiology, Pennsylvania State University, University Park
3. Department of Physical Therapy, University of North Georgia, Dahlonega
4. University School of Physical Education, Wroclaw, Poland
5. School of Medicine and Surgery, University of Milano-Bicocca, Milan, Italy
6. Faculty of Health and Social Sciences, Norwegian University of Science and Technology, Trondheim