?:authorAffiliation
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[\'Kore University of Enna, Faculty of Economics and Law, Italy. Electronic address: amedeo.argentiero@unikore.it.\', \'University of Rome Tor Vergata, Department of Economics and Finance, and SEEDS, Italy. Electronic address: damato@economia.uniroma2.it.\', \'University of Rome Tor Vergata, Department of Economics and Finance, and SEEDS, Italy. Electronic address: zoli@uniroma2.it.\']
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