Funding for this research was provided by:
Ministero dell’Istruzione, dell’Università e della Ricerca (PON03PE_00107_1/1)
Text and Data Mining valid from 2018-08-07
Received: 21 May 2018
Accepted: 16 July 2018
First Online: 7 August 2018
Compliance with Ethical Standards
: The authors declare that they have no conflict of interest.