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Authors
Yan, Changzhi
Gao, Xianda
Sun, Yadong
Dong, Zhen
Shen, Yong
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Article History
Received: 29 July 2018
Accepted: 24 October 2018
First Online: 13 November 2018
Authors’ information
: Not applicable.
: This retrospective study was approved by the Institutional Ethics Board of the Third Hospital of Hebei Medical University. All enrolled patients were informed and agreed to provide relevant data for this study. The methods were carried out in accordance with the relevant guidelines.
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
