Funding for this research was provided by:
the Basic Research Program of Yunnan Province (No. 2017FB148)
Received: 13 October 2019
Accepted: 26 May 2020
First Online: 5 June 2020
Ethics approval and consent to participate
: The study was approved by the ethics committee of Kunming Children’s Hospital (No. 20181226001). Written consent for participation was obtained from the parents/legal guardians at the time of the study.
: Written informed consent was obtained from the parents/legal guardians for publication of this study and any accompanying images and videos. A copy of the written consent is available for review by the Editor of this journal.
: The authors declare that they have no competing interests.