Guan, Bingsheng
Yang, Jingge
Chen, Yanya
Yang, Wah
Wang, Cunchuan http://orcid.org/0000-0003-2576-7462
Article History
First Online: 12 May 2018
Compliance with Ethical Standards
:
: The authors declare that they have no conflict of interest.
: Informed consent was obtained from all individual participants included in the study.
: As a retrospective study, ethnic approval was not necessary due to the local ethics committee.