Funding for this research was provided by:
University Research Committee, University of Hong Kong (14206716)
Fondation Yves Cotrel de l'Institut de France (CUHK 411811)
Received: 12 March 2020
Accepted: 3 August 2020
First Online: 18 August 2020
Ethics approval and consent to participate
: The study procedure was conducted in accordance with guidelines approved by the institutional clinical research ethics committee (CREC No. 2016.722) and the Declaration of Helsinki. Written informed consent was obtained from all subjects and their parents before participating in this study.
: Not applicable.
: The authors declare that they have no competing interests.