1. KOF Swiss Economic Institute, Department of Management, Technology, and Economics (D-MTEC), ETH Zurich , 8092 Zurich , Zurich , Switzerland
2. Institute of Public Health, Medical Decision Making and Health Technology Assessment, Department of Public Health, Health Services Research and Health Technology Assessment, UMIT - University for Health Sciences, Medical Informatics and Technology , Hall in Tirol , Austria
3. Centre for Infectious Disease Epidemiology & Research, School of Public Health and Family Medicine, University of Cape Town , Cape Town , South Africa
4. Swiss National Bank, Department I , 8022 Zurich , Zurich , Switzerland