1. Research on Economics, Management and Information Technologies, REMIT, Portucalense University, Rua Dr. António Bernardino Almeida, 541-619, 4200-072 Porto, Portugal
2. School of Management, ISLA—Polytechnic Institute of Management and Technology, Rua Diogo Macedo n.º 192, 4400-107 Vila Nova de Gaia, Portugal