1. Nuffield Department of Primary Care Health Sciences University of Oxford Oxford UK
2. Department of Social and Political Science Bocconi University Milano Italy
3. Department of Economics University of Pittsburgh and IZA Pittsburgh Pennsylvania USA
4. Dipartimento di Economia e FinanzaUniversità Universita’ degli Studi di Bari “A. Moro” Bari Italy
5. Business School Brunel University London United Kingdom
6. Department of Economics Ca' Foscari Venezia Italy
7. Nuffield Department of Primary Health Care Science University of Oxford Centre for Health Service and Economics Organisation Oxford UK