Liu, Yan-ling
Wang, Dun-wei
Yang, Zhu-chun
Ma, Rui
Li, Zhong
Suo, Wei
Zhao, Zhuang
Li, Zhi-wen http://orcid.org/0000-0003-2970-5832
Article History
Received: 15 July 2019
Accepted: 29 July 2019
First Online: 14 August 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: This article does not contain any studies with human participants or animals performed by any of the authors.
: As this study is based on a publicly available database without identifying patient information, informed consent was not needed.