Hu, Yan-jia
Xie, Yue-bing
Zhang, Li-feng
Ding, Chang
Chen, Jing
Article History
Received: 8 November 2019
Accepted: 16 April 2020
First Online: 24 April 2020
Ethics approval and consent to participate
: This study was approved by Biomedical Ethics Board of Sichuan University West China Hospital. Owing to the retrospective nature of the study, the requirement for informed consent was waived.
: Not applicable.
: The authors declare that they have no competing interests.