Received: 19 February 2020
Accepted: 25 August 2020
First Online: 5 September 2020
Ethics approval and consent to participate
: This study was approved by the ethics committee (N°502/2019) of the Policlinico Ca′ Granda Hospital in Milan (Comitato Etico Milano Area 2).
: Given the retrospective nature of the study, the ethics committee waived the need for informed consent.
: The authors declare that they have no competing interests related to the present study.