Received: 1 September 2019
Accepted: 3 December 2019
First Online: 10 December 2019
Ethics approval and consent to participate
: The current study was approved by the Committee on Human Study of the Beijing Children’s Hospital and the Ethics Review Committee of Beijing Children’s Hospital (No. 2019-k-11).
: Not Applicable.
: All of the authors including Wei Yang, Yiwei Chen, Yijin Huang and Huanmin Wang declare that they had no conflict of interests.