Li, Xuehan
Huang, Tao
Xu, Kai
Li, Chenglin
Li, Yirong
Funding for this research was provided by:
National Natural Science Foundation of China (Grant No. 81371779)
Natural Science Foundation of Hebei Province (Grant No. 2016CFB672)
Article History
Received: 27 June 2019
Accepted: 9 October 2019
First Online: 22 October 2019
Ethics approval and consent to participate
: This study was approved by the Ethics Committee of Hainan General Hospital. This was a retrospective study without any collection of clinical and personal information from patients, so informed consent was not required.
: Not applicable.
: The authors declare that they have no competing interests.