Ren, Caiyue
Wang, Shengping
Zhang, Shengjian
Funding for this research was provided by:
National Natural Science Foundation of China (81871347)
Article History
Received: 11 September 2019
Accepted: 29 December 2019
First Online: 13 January 2020
Ethics approval and consent to participate
: This study was approved by the medical ethics committee of our institution. For this retrospective study, the requirement for informed consent was waived.
: Yes
: The authors declare that they have no competing interests.