Received: 12 February 2021
Accepted: 21 April 2021
First Online: 4 May 2021
: A French ethics committee (Pitié-Salpêtrière Hospital, Paris) and the institutional review board for observational studies and the audit committee of the University Hospital of Padova approved the study.
: French law does not require signed patients’ informed consent for medical research using data collected from retrospective chart reviews. Concerning data from the Italian centre, patients who fulfilled the inclusion requirements were contacted and asked to sign informed consent forms. Their medical records were then retrieved and reviewed.
: The author(s) declare(s) that they have no competing interests.