Funding for this research was provided by:
Università degli Studi di Napoli Parthenope (Ricerca individuale 2015-2017)
Text and Data Mining valid from 2019-07-11
Received: 11 January 2018
Accepted: 6 July 2019
First Online: 11 July 2019
Compliance with ethical standards
: The author declare that he have no conflict of interest.
: This article does not contain any studies with human participants or animals performed by the author.