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Article History

Received: 11 February 2020

Revised: 30 May 2020

Accepted: 11 August 2020

First Online: 24 August 2020

Compliance with ethical standards

:

: The scientific guarantor of this publication is Emanuele Neri.

: 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.

: No complex statistical methods were necessary for this paper.

: Written informed consent was not required for this study because this article does not contain any studies directly involving human participants or animals performed by any of the authors.

: Institutional Review Board approval was not required because this article does not contain any studies directly involving human participants or animals performed by any of the authors.

: • retrospective• observational• multicentre study