1. Department of Electrical & Computer Engineering, University of Patras, Patras, Greece GR
2. Department of Business Administration (LAIQDA Lab), Technological Educational Institute of Peloponnese, Kalamata, Greece GR
3. Department of Computer Engineering & Informatics, Technological Educational Institute of Western Greece, Antirrio, Greece GR
4. Department of Mathematics, University of Patras, Patras, Greece GR