Received: 18 February 2021
Accepted: 28 May 2021
First Online: 21 June 2021
: The ethics Committee of the Affiliated Hospital of Chengdu University of Chinese Medicine approved the study.All study procedures involving human subjects conform to the ethical standards of the Ethics Committee of the Hospital affiliated to Chengdu University of Traditional Chinese Medicine and the 1964 Helsinki Declaration and its subsequent amendments or similar ethical standards. We had no access to information that could identify individual participants, so our research does not involve patients’ personal information and written informed consent was waived by the ethics Committee of the Affiliated Hospital of Chengdu University of Chinese Medicine.
: Not applicable.
: The authors declare that they have no competing interests