Hasselt University &/ Transnational University of Limburg, Diepenbeek, Belgium and Fellow of the Fund for Scientific Research, Flanders (FWO);Informatics Institute, Universiteit van Amsterdam/ Amsterdam, The Netherlands;Technical University of Dortmund/ Dortmund, Germany;Hasselt University &/ Transnational University of Limburg, Diepenbeek, Belgium;Informatics Institute, Universiteit van Amsterdam/ Amsterdam, The Netherlands