1. CeRGAS, Centre for Research on Health and Social Care Management, Bocconi University, Milan, Italy, and University of Exeter Medical School; Exeter UK
2. Azienda Ospedaliera Universitaria Senese; Siena Italy
3. University of Siena; Siena Italy
4. CeRGAS, Centre for Research on Health and Social Care Management, Bocconi University; Milan Italy