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Article History

Received: 17 June 2020

Revised: 16 October 2020

Accepted: 4 November 2020

First Online: 17 November 2020

Compliance with ethical standards

:

: The scientific guarantor of this publication is Prof. Letterio S. Politi.

: The authors of this manuscript declare no relationships with any companies, whose products or services may be related to the subject matter of the article.

: Dr. Emanuela Morenghi kindly provided statistical advice for this manuscript.

: Written informed consent was obtained from all subjects (patients) in this study.

: Institutional Review Board approval was not required because of the retrospective nature of the study.

: • retrospective• observational• performed at one institution