1. Ministry of Planning and Finance of São Tomé and Príncipe, São Tome 168, Sao Tome and Principe
2. DEGEIT—Department of Economics, Management and Industrial Engineering and Tourism, Campus Universitário de Santiago, University of Aveiro, 3810-193 Aveiro, Portugal
3. GOVCOPP—Research Unit on Governance, Competitiveness and Public Policies, University of Aveiro, 3810-193 Aveiro, Portugal
4. NECE-UBI—Research Center for Business Sciences, Universidade da Beira Interior, 6200-209 Covilhã, Portugal
5. CICEE—Research Center in Business and Economics, Universidade Autónoma de Lisboa, 1150-293 Lisboa, Portugal