Zhang, He
Mao, Yunfei
Chen, Xiaojun
Wu, Guoqing
Liu, Xuefen
Zhang, Peng
Bai, Yu
Lu, Pengcong
Yao, Weigen
Wang, Yuanyuan
Yu, Jinhua
Zhang, Guofu
Article History
Received: 21 September 2018
Revised: 9 February 2019
Accepted: 22 February 2019
First Online: 8 April 2019
Compliance with ethical standards
:
: The scientific guarantor of this publication is Guofu Zhang.
: The authors of this manuscript declare no relationships with any companies, whose products or services may be related to the subject matter of the article.
: Statistician Yu Bai kindly provided all statistical work for this study.
: Written informed consent was waived by the Institutional Review Board.
: Institutional Review Board approval was obtained.
: • Retrospective• Observational• Performed at one institution