Xie, Ri-hua
Guo, Xiaoyan
Li, Meng
Liao, Yan
Gaudet, Laura
Walker, Mark
Lei, Huizhong
Wen, Shi Wu http://orcid.org/0000-0002-7227-0283
Article History
Received: 15 April 2019
Accepted: 20 September 2019
First Online: 26 October 2019
Ethics approval and consent to participate
: This cohort study used data collected for routine quality assurance purposes, thus the Research Ethics Board of The Sixth Affiliated Hospital of Guangzhou Medical University concluded that an ethical approval was not required and consent from patients was not required.
: Not applicable.
: The authors declare that they have no competing interests.