Ioannis Vogiatzis
University of Patras, Department of Business Administration, University Campus, Rion 26500 Patras, Greece.
Costas Siriopoulos
University of Patras, Department of Business Administration, University Campus, Patras, Greece, GR 26500
Greece
Professor, University of Patras, Department of Business Administration
Nikolaos Frangos
Athens University of Economics, Department of Statistics, Patission 76, 10434 Athens, Greece.
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