Tang, Xiaolei
Li, Huimin
Liu, Hui
Xu, Hui
Yang, Haiming
Liu, Jinrong
Zhao, Shunying
Article History
Received: 13 May 2019
Accepted: 3 December 2019
First Online: 22 January 2020
Ethics approval and consent to participate
: This retrospective study was approved by the ethical committee of the Beijing Children’s Hospital, Capital Medical University (2018-k-138).
: Not applicable.
: The authors declare that they have no competing interests.