Funding for this research was provided by:
MSD China, Shanghai, China (50146)
Article History
Received: 6 June 2021
Accepted: 9 September 2021
First Online: 6 October 2021
Compliance with ethical standards
:
: This study was approved by the Ethics Committee of the Beijing Children’s Hospital, Capital Medical University (approval number: 2012-70). All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Written informed consent was obtained from all individual participant’s guardians included in the study.
: None of the authors declare any conflict of interest in this study. Authors Zhimin Chen and Jianguo Hong are members of the Editorial Board for the <i>World Journal of Pediatrics</i>. The paper was handled by the other Editor and has undergone a rigorous peer-review process. Authors Zhimin Chen and Jianguo Hong were not involved in the journal’s review of, or decisions related to, this manuscript.