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Authors
Ji, Gang
Wang, Haoyu
Su, Xiaoqing
Wang, Jinliang
Wang, Fei
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Article History
Received: 14 January 2019
Accepted: 2 July 2019
First Online: 16 July 2019
Compliance with ethical standards
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: The authors declare that they have no competing interest.
: The study was approved by the Medical Ethical Committee of the Third Hospital of Hebei Medical University (Ke-2011-K-086).
: Informed constent was obtained from all indivodual participants included in the study.
