1. Digital Socity Center, SNESE Unit, Fondazione Bruno Kessler, Trento, Italy
2. Connected Intelligence, Research Institutes of Sweden AB, Stockholm, Sweden
3. Corporate Research, Robert Bosch GmbH, Gerlingen, Germany
4. Information Engineering Department, Università Politecnica delle Marche, Ancona, Italy
5. Department of Computer Science, KTH Royal Institute of Technology, Stockholm, Sweden