Funding for this research was provided by:
Down Fellowship at Yale University, New Haven, Connecticut.
Received: 17 April 2020
Accepted: 26 June 2020
First Online: 6 July 2020
Ethics and consent to participate
: This study was reviewed and approved by the <i>Comité d’Ethique Institutionnel pour la Recherche en Santé (CEIRES)</i> of IRSS. The parents/guardians of all participants of this study provided informed consent before enrollment in the study.
: Not applicable.
: All authors of this paper declared that there are no competing interests.