Funding for this research was provided by:
Ministero dell'Istruzione, dell'Universit&#x00E0; e della Ricerca (Ministry of Education, University and Research) (RBFR10OAI0)
Text and Data Mining valid from 2018-08-23
Received: 24 October 2017
Accepted: 2 August 2018
First Online: 23 August 2018
: The authors declare no competing interests.