1. University of Nicosia and University of Nicosia Research Foundation,Department of Computer Science,Nicosia,Cyprus
2. Hellenic Mediterranean University,Department of Management Science and Technology,Agios Nikolaos,Crete,Greece
3. Warsaw University of Technology and National Institute of Telecommunications,Warsaw,Poland
4. School of Engineering University of West Attica,Department of Industrial Design and Production Engineering,Athens,Greece
5. International Hellenic University Thessaloniki, Greece and University of New Mexico,Albuquerque,USA