Zhou, Quanyu
Xia, Yuxiao
Lei, Zehua
Article History
Received: 7 March 2020
Accepted: 22 April 2020
First Online: 6 May 2020
Ethics approval and consent to participate
: This retrospective study was performed with approval from the Ethics Committee of People’s Hospital of Leshan. A written informed consent from the patients was waived because this study was performed retrospectively.
: Not applicable.
: The author(s) declare that they have no competing interests.