Article History
Received: 13 November 2019
Accepted: 16 January 2020
First Online: 31 January 2020
Compliance with ethical standards
: The study was approved by the Ethics Committee of the health department of the city of Paris (no. 2019/0302). Although we have not been able to reach every patient, all patients under 18 or their legal representatives were informed about the retrospective analysis of their anonymized data.
: The authors declare that there is no conflict of interest.