Funding for this research was provided by:
National Natural Science Foundation of China (81691877)
Received: 8 February 2020
Accepted: 20 May 2020
First Online: 3 June 2020
Ethics approval and consent to participate
: Ethical approval was obtained from the Institution Review Board of the Xi’an Hospital of Traditional Chinese Medicine. All participants in this study were provided with explanations via face-to-face interpretation and a written informed consent was obtained before inclusion.
: Not Applicable.
: The authors declare that they have no competing interests.