1. Department of Electrical, Computer and Biomedical Engineering; University of Pavia; 27100 Pavia Italy
2. Department of Robotics and Mechatronics; Nazarbayev University; 010000 Astana Kazakhstan
3. Institute of Mechanical Engineering; Federal Institute of Technology (EPFL); 1015 Lausanne Switzerland
4. Civil Engineering and Architecture Department; University of Pavia; 27100 Pavia Italy
5. Automatic Control Laboratory; Federal Institute of Technology (ETH); 8092 Zurich Switzerland