1. Aristotle University of Thessaloniki, Hellenic Open University,Dept. of Journalism and Mass Communications,Thessaloniki,Greece
2. University of Western Macedonia,Dept. of Informatics,Kastoria,Greece
3. Aristotle University of Thessaloniki,Faculty of Law,Thessaloniki,Greece
4. International Hellenic University,Dept. of Management Science and Technology,Kavala,Greece
5. Aristotle University of Thessaloniki,Dept. of Journalism and Mass Communications,Thessaloniki,Greece
6. University of Western Macedonia, Hellenic Open University,Department of Informatics,Kastoria,Patras,Greece