1 Laboratory of Physics, Faculty of Electrical Engineering, University of Ljubljana, Tržaška 25, 1000, Ljubljana, Slovenia. mitja.drab@fe.uni-lj.si.
2 Department of Mechanics, Biomechanics and Mechatronics, Faculty of Mechanical Engineering, Czech Technical University in Prague, Technicka 4, Prague, 16607, Czech Republic. mitja.drab@fe.uni-lj.si.
3 Department of Mechanics, Biomechanics and Mechatronics, Faculty of Mechanical Engineering, Czech Technical University in Prague, Technicka 4, Prague, 16607, Czech Republic.
4 Faculty of Health Sciences, Laboratory of Clinical Biophysics, University of Ljubljana, Zdravstvena pot 5, 1000, Ljubljana, Slovenia.
5 Laboratory of Physics, Faculty of Electrical Engineering, University of Ljubljana, Tržaška 25, 1000, Ljubljana, Slovenia.
6 Laboratory of Clinical Biophysics, Faculty of Medicine, University of Ljubljana, Vrazov trg 2, 1000, Ljubljana, Slovenia.