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. University of West Attica,School of Engineering,Department of Industrial Design and Production Engineering,Athens,Greece