Received: 2 September 2019
Accepted: 6 December 2019
First Online: 23 December 2019
Ethics approval and consent to participate
: French observational studies without any additional therapy or monitoring procedure do not need the approval of a national ethical committee. Accordingly, this retrospective study was approved by our institutional Ethics Committee (CLERS #479).
: Not applicable
: D. Agostini declares consultancy for Spectrum Dynamics.