1. Prof. K. Baršauskas Ultrasound Research Insititute, Kaunas University of Technology, K. Baršausko St. 59, LT-51423 Kaunas, Lithuania
2. Department of Electronics Engineering, Kaunas University of Technology, Studentu St. 50, LT-51368 Kaunas, Lithuania
3. Department of Mechanical Engineering, Kaunas University of Technology, Studentu St. 56, LT-51424 Kaunas, Lithuania