Received: 21 July 2019
Accepted: 21 November 2019
First Online: 5 December 2019
Ethics approval and consent to participate
: This study was approved by the French Society of Anaesthesiology and Critical Care Medicine Ethics Committee (00010254-2015-017) and the French Personal Data Protection Agency (16–023).
: According to French legislation, this observational study did not require the patients’ informed consent.
: The authors declare that they have no competing interests.