Article History
Received: 9 July 2020
Accepted: 9 December 2020
First Online: 6 January 2021
Ethics approval and consent to participate
: This study was approved by the ethics committee of the Children’s Hospital of Nanjing Medical University (Grant NO.202008090–1). Individual informed consent was waived by the ethics committee listed above because this study used currently existing sample collected during the course of routine medical care and did not pose any additional risks to the patients. All patient data were anonymized prior to the analysis. Any administrative permissions and/or licenses were acquired by the ethics committee of the Children’s Hospital of Nanjing Medical University to access the data used in our research.
: Not applicable.
: The authors declare that they have no competing interests.