Qin, Hong
Yang, Shen
Cai, Siyu
Ren, Qinghua
Han, Wei
Yang, Wei
Cheng, Haiyan
Ma, Xiaoli
Wang, Huanmin
Article History
Received: 16 October 2019
Accepted: 6 March 2020
First Online: 23 March 2020
Ethics approval and consent to participate
: All methods were carried out in accordance with relevant guidelines and regulations, and the study was approved by the Medical Ethics Committee of Beijing Children’s Hospital (2017-k-89). A waiver of consent was awarded to conduct analyses in this study due to the retrospective nature of the study.
: Not applicable.
: The authors declare that they have no competing interests to report.