1. Department of PhysicsAristotle University of ThessalonikiThessaloniki54124Greece
2. Department of InformaticsUniversity of Piraeus80 Karaoli and Dimitriou StreetGR‐185 34Greece
3. Department of Informatics and Telecommunications EngineeringUniversity of Western MacedoniaKaramanli & LigerisKozani50100Greece
4. King Abdullah II School of IT, University of JordanJordan