Received: 18 December 2019
Accepted: 25 March 2020
First Online: 7 April 2020
Ethics approval and consent to participate
: The clinical ethics committee of the Besançon Teaching Hospital approved the study and all parents provided informed consent. The study was also approved by the French Advisory Committee on Information Processing in Material Research in the Field of Health (agreement#2014/165). The written informed consent was obtained from all parents.
: Not applicable.
: The authors declare that they have no competing interests.