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Article History

Received: 26 February 2018

Accepted: 22 May 2019

First Online: 10 June 2019

Compliance with ethical standards

:

: The authors declare that they have no conflict of interest.

: This study was approved by the ethics committee of the Department of Surgical Science of the University of Cagliari.

: The retrospective observational study included in this paper involved Human Participants.

: Informed consent was obtained from all individual participants.