1. Department of Economics and Finance; University of Rome “Tor Vergata”; Rome Italy
2. Center for Health Policy; Stanford University; Stanford California
3. CEIS Tor Vergata; University of Rome “Tor Vergata”; Rome Italy
4. Italian College of General Practitioners (SIMG); Florence Italy
5. Charles Perkins Center and Central Clinical School; University of Sidney; Sidney New South Wales
6. Department of Clinical and Experimental Sciences; Brescia University; Brescia Italy