Yang, Yong
Nicholas, Stephen
Maitland, Elizabeth
Huang, Zhengwei
Chen, Xiaoping
Ma, Yong
Shi, Xuefeng
Article History
Received: 27 January 2021
Accepted: 21 April 2021
First Online: 5 May 2021
Declarations
:
: Since the claims data we used was an anonymized and secondary database, human participants are not directly involved in the study, the informed consent was exempted. This study was approved by the Ethics Committee of Beijing University of Chinese medicine (No.2019BZHYLL0201).
: Not applicable.
: The authors declare that they have no competing interests.