1. State School of Higher Vocational Education , Institute of Physical Education, Nowy Sącz, Poland
2. Department of Orthopaedic Surgery, Luxmed Hospital, Warsaw, Poland
3. DEPARTMENT OF ORTHOPEDIC AND TRAUMATOLOGY OF THE MUSCULOSKELETAL SYSTEM, MEDICAL UNIVERSITY OF WARSAW, WARSAW, POLAND
4. ARS MEDICA FOUNDATION FOR MEDICAL EDUCATION AND PROMOTION OF HEALTH AND CULTURE, WARSAW, POLAND