Funding for this research was provided by:
Università di Cagliari (2012 CAR—Contributo d’ateneo per la ricerca)
Text and Data Mining valid from 2018-12-12
Received: 4 June 2018
Accepted: 3 December 2018
First Online: 12 December 2018
Compliance with ethical standards
: Authors declare that they have no conflict of interest.
: The institutional review board approved the study protocol in accordance with the guidelines of the 1995 Declaration of Helsinki and their revisions.
: All participants provided informed consent. Participation was voluntary and with no compensation.