Text and Data Mining valid from 2019-06-24
Received: 18 March 2019
Accepted: 5 June 2019
First Online: 24 June 2019
Ethics approval and consent to participate
: All patients gave their fully informed, voluntary, and written consent according to the principles of the Declaration of Helsinki and in compliance with the ethics committee of the University of Siena, whose institutional review board approved the entire study protocol.
: Not applicable.
: The authors declare that they have no competing interests.