Received: 24 February 2021
Accepted: 5 May 2021
First Online: 29 July 2021
: Patients had to sign a routine informed consent form regarding surgical treatment, and additional informed consent for analysis of their data, as requested by the ethical committee according to Helsinki Declaration (1975) and further revisions. All procedures performed in studies involving human participants are in accordance with the ethical standards of the institutional and/or national research committee (Local Ethical Committee of the University of Pisa for retrospective analysis 2626-2008 PROT n° 58183).
: Not applicable
: The authors declare that they have no competing interests.