1. MEDCIDS—Department of Community Medicine , Information and Health Decision Sciences, Faculty of Medicine, , 4200-450 Porto, Portugal
2. University of Porto , Information and Health Decision Sciences, Faculty of Medicine, , 4200-450 Porto, Portugal
3. CINTESIS—Centre for Health Technology and Services Research , 4200-450 Porto, Portugal
4. Public Health Unit, ACES Grande Porto VIII – Espinho/Gaia, ARS Norte , 4405-535 VIla Nova de Gaia, Portugal
5. Center for Economics and Finance , , 4200-464 Porto, Portugal
6. University of Porto , , 4200-464 Porto, Portugal
7. Nova School of Business and Economics , , 2775-405 Carcavelos, Portugal
8. Universidade NOVA de Lisboa , , 2775-405 Carcavelos, Portugal
9. NIPE - Centre for Research in Economics and Management , , 4710-057 Braga, Portugal
10. University of Minho , , 4710-057 Braga, Portugal