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Authors
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Funding
Funding for this research was provided by:
National Natural Science Foundation of China (71804111)
National Key Scientific Instrument and Equipment Development Projects of China (2020YQFK01)
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Article History
Received: 8 May 2020
Accepted: 19 November 2020
First Online: 30 November 2020
Ethics approval and consent to participate
: This study did not involve any human participants. The data used in our analysis are publicly available. Hence, this study was not considered to require assessment by the ethics review boards of the relevant hospitals.
: Not applicable.
: The authors declare that they have no competing interests.
