Received: 25 September 2020
Accepted: 12 January 2021
First Online: 22 January 2021
Ethics approval and consent to participate
: The study was approved by the Committee for Research Ethics of French Society of Anesthesia & Intensive Care Medicine (CERAR no. IRB 00010254-2016-122). The study was also registered in ClinicalTrials.gov (NCT02967809).
: This manuscript has been read and its submission approved by all the coauthors. The patients were prospectively included after providing informed consent.
: LZ and XB received fees from General Electric Healthcare for ultrasound teaching.