1. Department of Engineering Cybernetics, Norwegian University of Science and Technology, Trondheim, Norway
2. Institute for Automation Engineering, Otto-von-Guericke-University Magdeburg, Magdeburg, Germany
3. Department of Engineering Sciences, Uppsala University, Uppsala, Sweden
4. Department of Arts, Communication and Education, Luleå University of Technology, Luleå, Sweden
5. Department of Information Technology, Uppsala University, Uppsala, Sweden