Received: 7 June 2018
Accepted: 23 October 2019
First Online: 14 November 2019
Ethics approval and consent to participate
: The study protocol was approved by the ethics committee of Children’s Hospital of Fudan University, No. 2017 (15). Written consent to participate was obtained from all participants. Consent was obtained from a parent or guardian on behalf of any participants under the age of 16.
: Not applicable.
: The authors declare that they have no competing interests.