Received: 26 June 2019
Accepted: 7 November 2019
First Online: 21 November 2019
Ethics approval and consent to participate
: This retrospective study based on previously collected data was complied in accordance with the Declaration of Helsinki and French ethics guidelines. This study was approved by the regional ethics committee and the French committee of informatics and civil liberties (CNIL, conformity agreement n°2204611). All patients received a non-opposition letter, as requested by French authorities for retrospective studies.
: Not applicable
: The authors declare that they have no competing interests.