1. Department of Computer Science, Lund University, Sweden
2. IT University of Copenhagen, Denmark, and Lund University Sweden
3. Helsinki Institute for Information Technology HIIT, Department of Information and Computer Science, Aalto University, Finland
4. Helsinki Institute for Information Technology HIIT, Department of Computer Science, University of Helsinki, Finland
5. Department of Information and Computing Sciences, Utrecht University, the Netherlands
6. Science for Life Laboratory and School of Computer Science and Communication, Royal Institute of Technology (KTH), Sweden