1 Centre for Research on Health and Social Care Management (CERGAS) and The European Health Technology Institute for Socio-Economic Research (EHTI), Milan, Italy.
2 Bocconi University, Milano, Italy.
3 Bocconi University, Milan, Italy.
4 Centre for Research on Health and Social Care Management (CERGAS), Milan, Italy.
5 Università del Piemonte Orientale, Novara, Italy.