Text and Data Mining valid from 2020-03-24
Received: 10 January 2020
Accepted: 17 March 2020
First Online: 24 March 2020
Ethics approval and consent to participate
: Since the data sets we used were anonymized database and had no impact on patients’ health and care, the informed consent was exempted. This study was approved and the permission to access the raw data was granted by the Ethics Committee of Beijing University of Chinese medicine (No.2019BZHYLL0201).
: Not Applicable.
: The authors declared that they have no competing interests.