1 Institute of Physiotherapy and Health SciencesMusculoskeletal Elastography and Ultrasonography LaboratoryThe Jerzy Kukuczka Academy of Physical EducationKatowice, Poland.
2 Institute of Physiotherapy and Health SciencesMusculoskeletal Elastography and Ultrasonography LaboratoryThe Jerzy Kukuczka Academy of Physical EducationKatowice, Poland linek.fizjoterapia@vp.pl.