Received: 6 June 2018
Accepted: 17 October 2018
First Online: 21 November 2018
Ethics approval and consent to participate
: This study was strictly observational and retrospective. It was conducted in compliance with the French regulations. As the Electroneurography procedure is already approved for clinical use at the authors’ institution, this study did not require Ethics Committee approval.The parents of all the children gave their consent for the medical records to be used and all data processing was carried out in compliance with the French Information Technology and Privacy Law.
: As details on individuals reported within the manuscript are entirely unidentifiable, consent for publication in OJRD was not requested from parents.
: BH has received travel expenses, and been invited to meetings funded and organized by Biomarin, Genzyme Corporation and Shire HGT. KM, MM and TB declare that they have no competing interests.
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