1. Aristotle University of Thessaloniki,ELEDIA@AUTH, School of Physics,Thessaloniki,Greece
2. University of Macedonia,Dept. of Applied Informatics,Thessaloniki,Greece
3. University of Macedonia,Dept. of Music Science and Art,Thessaloniki,Greece
4. University of Macedonia,Dept. of International and European Studies,Thessaloniki,Greece
5. International Hellenic University,Dpt. of Information and Electronic Eng.,Sindos,Greece