Received: 30 April 2019
Accepted: 24 September 2019
First Online: 18 October 2019
Ethics approval and consent to participate
: This study was authorized by the local ethics committee, named <i>Comité d’éthique du CHU de Rennes</i> (Rennes University Hospital), committee’s reference number 13.06. Data used in this study was anonymised before its use.
: Not applicable
: The authors declare that they have no competing interests.