Received: 8 January 2021
Accepted: 22 April 2021
First Online: 18 May 2021
: The study was conducted in accordance with the Declaration of Helsinki in 1975 and the REMARK guidelines for biomarker studies. Signed informed consent was obtained from all participants. For the minors under the age of 18 years, informed consent has been obtained from a parent and/or legal guardian. This study was approved by the institutional research ethics committee of Beijing Tiantan Hospital.
: Not applicable.
: All authors declare that they have no competing interests.