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Article History

Received: 29 September 2020

Revised: 24 November 2020

Accepted: 17 December 2020

First Online: 12 March 2021

Compliance with ethical standards

:

: The scientific guarantor of this publication is Guy Frija.

: 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 no individual data was collected. Data was anonymised.

: Institutional Review Board approval was not required because it is not applicable to this paper.

: • retrospective• observational• multicentre study