Funding for this research was provided by:
Università degli Studi di Pavia
Received: 15 July 2020
Accepted: 30 September 2020
First Online: 17 October 2020
Compliance with ethical standards
: The authors declares that they have no conflict of interest.
: Formal approval by the ethical committee was not required in accordance with the Italian regulation for non-interventional (observational) retrospective studies concerning human beings (AIFA Guidelines for Observational Studies, see ExternalRef removed).
: All patients signed an informed consent concerning the future use of their clinic data for research purposes and data collected remained strictly confidential and anonymous, according to the ethical rules of our Hospital institutions and to the Declaration of Helsinki.