Received: 1 August 2021
Accepted: 30 August 2021
First Online: 15 September 2021
: The study was approved by an institutional ethics committee at the Baoji City Hospital of Traditional Chinese Medicine (Ethics application number: 2021GYKJD5N). Considering that this work was a retrospective study, the ethics committee waived the requirement for informed consent from patients.
: Not applicable.
: The authors declare that they have no competing interests.