Funding for this research was provided by:
National Natural Science Foundation of China (32070188, 81601778)
Research Foundation of Capital Institute of Pediatrics (FX-2020-02)
CAMS innovation Fund for Medical Sciences (2016-I2M-1-008)
Received: 5 November 2020
Accepted: 4 February 2021
First Online: 12 February 2021
Ethics approval and consent to participate
: The present study was performed in compliance with the Helsinki Declaration (Ethical Principles for Medical Research Involving Human Subjects) and was approved by the research board of the Ethics Committee of the Capital Institute of Pediatrics, Beijing, China. The patient data were anonymously reported. Based on the guidelines of the Ethics Committee of the Capital Institute of Pediatrics, informed consent was not sought from the patients.
: Not applicable.
: The authors declare that there are no competing interests associated with this manuscript.