Zheng, Chao
Zhou, Hong
Zhu, Hai
Chen, Bailin
Qiu, Lin
Guo, Chunbao http://orcid.org/0000-0001-5121-9377
Article History
Received: 25 November 2018
Accepted: 15 August 2019
First Online: 26 September 2019
Ethics approval and consent to participate
: This study was exempted from review by the institutional review board at the Chongqing Medical University, and the requirement for informed consent was waived given the retrospective design of the study.
: Not applicable.
: The authors declare that they have no competing interests.