1. Utrecht University, Utrecht, the Netherlands and Chalmers University of Technology, Gothenburg, Sweden
2. TU Darmstadt, Darmstadt, Germany
3. i3, Fondazione Bruno Kessler, Trento, Italy
4. Institute of Applied Computer Science, Lodz University of Technology, Lodz, Poland
5. University of Bremen, Bremen, Germany and University of St. Gallen, St. Gallen, Switzerland