Article History
First Online: 25 June 2018
Compliance with Ethical Standards
: A. Antoci and P. Russu received research grants from Regione Autonoma della Sardegna (L.R. 7/2007) under the project ‘Capitale sociale e divari economici regionali’. A. Fiori Maccioni received research grants from P.O.R. FSE Sardegna 2007/13 under the project ‘Risk Management System per aziende sanitarie’.
: The authors declare that the funding sources had no involvement in the research and have no conflicts of interest.