1. Department of Computer Science, Mobile Systems Laboratory, University of Nicosia, Nicosia, Cyprus
2. Department of Computer Science, University of Nicosia, Nicosia, Cyprus
3. Department of Internet Architectures and Applications, Warsaw University of Technology, Warsaw, Poland
4. Department of Electrical and Computer Engineering, Hellenic Mediterranean University, Heraklion, Estavromenos, Greece
5. Department of Management Science and Technology, Hellenic Mediterranean University, Agios Nikolaos, Greece