Received: 9 January 2019
Accepted: 19 May 2019
First Online: 28 May 2019
Ethics approval and consent to participate
: The study was approved by the ethics committee of the University Hospital of Rennes (approval no. 18.82). Consent of all patients has been obtained for this study.
: All patients gave their written consent for the use of their data for publication.
: The authors declare that they have no competing interests.