Zhai, Guangyu
Qi, Jintao
Chai, Guorong
Article History
Received: 4 January 2021
Accepted: 13 May 2021
First Online: 22 May 2021
Declarations
:
: The study protocol was approved by the ethics committee of Lanzhou University of Technology. The data is encrypted, the patient's name, address, and contact information are all hidden and an informed consent waiver is obtained from the ethics committee. The study was performed in accordance with the Declaration of Helsinki.
: Not applicable.
: The authors declare that they have no competing interests.