Funding for this research was provided by:
Text and Data Mining valid from 2018-07-17
Received: 3 January 2018
Accepted: 22 June 2018
First Online: 17 July 2018
Ethics approval and consent to participate
: Not applicable. The local ethics committee of the University and Azienda Ospedaliera Pisana ruled that no formal ethics approval was required in this particular case.A written informed consent was obtained from all participants before entering the study through the web-app.
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.