Constantinos Halkiopoulos
Department of Management Science and Technology, University of Patras, 26334 Patras,
Greece

Anastasios Papadopoulos
Department of Business Administration, University of Patras, 26504 Patras,
Greece

Yannis C. Stamatiou
2) Department of Business Administration, University of Patras, 26504 Patras, Greece. 3) Computer Technology Institute and Press “Diophantus”, University of Patras Campus, 26504 Patras, Greece.

Leonidas Theodorakopoulos
Department of Management Science and Technology, University of Patras, 26334 Patras,
Greece

Vasileios Vlachos
Department of Economics, University of Thessaly, GR-54124 Volos,
Greece