Ethical approval
The study met and conformed to the standards outlined in the principles of the Declaration of Helsinki of 1975 (as revised in 2008) and was conducted following the ethical standards of the responsible committee on human experimentation (Independent Ethical Committee for Clinical Trials of Cagliari University Hospital, Italy). Ethics Committee approval was obtained from the coordinating centre in Italy (Acceptance Code: Independent Ethics Committee of the University of Cagliari, Prot. P.G./2021/7108). All the investigators conducted the study according to the rules of the local ethics committee regarding the retrospective collection of data.