Received: 22 September 2020
Accepted: 4 January 2021
First Online: 23 January 2021
Compliance with ethical standards
: The authors declare that they have no competing interests.
: The study was approved by the Research Ethics Commission of Nantes University Hospital (GNEDS-13–04-2020). The sponsor of the study is CHU de Nantes (Nantes University Hospital), Delegation for Clinical Research and Innovation.
: Owing to its retrospective nature on de-identified data, an informed consent was waived. In France, the study is excluded from the legal requirements applicable to research involving humans within the provisions of the French Public Health Code.
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