Received: 13 January 2020
Accepted: 8 September 2020
First Online: 15 October 2020
Ethics approval and consent to participate
: The ethics committees of the Institute of Basic Research in Clinical Medicine, China Academy of Chinese Medical Sciences, granted exempt status for this study and also waived the need for informed consent. The patient consent was exempted due to the total anonymity of all research data in this study.
: Not applicable.
: The interpretation and conclusions contained herein do not represent the China Academy of Chinese Medical Sciences. The authors declare that they have no competing interests.