1. Department of Information and Communications Engineering, Faculty of Computer Science, University of Murcia, Murcia, Spain
2. SensingTools Company, Valencia, Spain
3. Department of Computer and Systems Informatics, Faculty of Computer Science, Polytechnic University of Valencia, Valencia, Spain
4. Department of Political Science, Public Finance and Social Anthropology, Faculty of Law, University of Murcia, Murcia, Spain
5. Department of Sociology, Faculty of Economics and Business, University of Murcia, Murcia, Spain