Text and Data Mining valid from 2019-04-01
Received: 21 January 2019
Accepted: 27 March 2019
First Online: 1 April 2019
Compliance with Ethical Standards
: Author Renato De Vecchis declares that he has no conflict of interest. Author Carmelina Ariano declares that she has no conflict of interest.
: This article does not contain any studies with human participants or animals performed by any of the authors.
: Informed consent from individual participants was not required for this study.