Zhang, Peiyao
Tong, Yuanyuan
Liu, Jinping http://orcid.org/0000-0002-4158-0211
Guo, Shengwen
Jin, Yu
Bai, Liting
Li, Yixuan
Feng, Zhengyi
Zhao, Ju
Article History
Received: 7 April 2021
Revised: 24 May 2021
Accepted: 30 June 2021
First Online: 17 July 2021
Competing interests
: The authors declare no competing interests.
: This study was approved by the Ethics Committee of Fuwai Hospital (approval number: 2014-600); informed consent from guardians was waived because of the retrospective nature of this study.