Funding for this research was provided by:
Ministero dell’Istruzione, dell’Università e della Ricerca (2010PHT9NF_001)
Text and Data Mining valid from 2019-11-05
Received: 29 May 2019
Accepted: 20 August 2019
First Online: 5 November 2019
Compliance with Ethical Standards
: The authors declare that they have no conflict of interest.