1. Technological Institute of Central Greece, Greece
2. Computer Technology Institute & Press “Diophantus”, Patras, Greece & Computer Engineering and Informatics Department, University of Patras, Patras, Greece
3. Molise Region, Italy
4. Computer Engineering and Informatics Department, University of Patras, Patras, Greece
5. Computer Technology Institute & Press “Diophantus”, Patras, Greece