Jiang, Yu
Guo, Xiaoqing
Qin, Junhong
Article History
Received: 25 March 2021
Accepted: 15 June 2021
First Online: 4 July 2021
Declarations
:
: The authors declare that they have no conflict of interest.
: The research was authorized by the Ethics Committee of the NO. 2 Hospital of Baoding and was carried out according to the guidelines of Declaration of Helsinki. Each participant signed a written informed consent before conducting this study.