1. Department of Economics, Management, Industrial Engineering and Tourism (DEGEIT), University of Aveiro, Aveiro, Portugal
2. Department of Economics, Management, Industrial Engineering and Tourism (DEGEIT) and CIDMA, University of Aveiro, Aveiro, Portugal
3. Department of Economics, Management, Industrial Engineering and Tourism (DEGEIT), IEETA and GOVCOPP, University of Aveiro, Aveiro, Portugal