1. Department of Biomechanics, Faculty of Mechanics, Vilnius Gediminas Technical University, Vilnius, Lithuania
2. Department of PM&R, Faculty of Medicine, University of Vilnius, Vilnius, Lithuania
3. Coventry University, Coventry, UK
4. Department of Theoretical Electrotechnics and Metrology, Bialystok University of Technology, Bialystok, Poland