Shen, Yanjiao
Hao, Qiukui
Wang, Yuting
Chen, Xiaoyan
Jiang, Jiaojiao
Dong, Birong
Guyatt, Gordon
Article History
Received: 21 February 2021
Accepted: 6 June 2021
First Online: 16 June 2021
Declarations
:
: The medical research ethics committee of West China Hospital, Sichuan university approved this study (No. 2018-95). This is a retrospective cohort study using anonymous data from medical record; the medical research ethics committee of West China Hospital, Sichuan university has approved the waiver of informed consent for the retrospective cohort study. (No. 2018-95).
: Not applicable.
: The authors declare that they have no competing interests.