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Authors
Liu, Yuanyuan https://orcid.org/0000-0003-0113-2438
Song, Hong
Song, Huanqing
Feng, Xiaoxia
Zhou, Chuan
Huo, Zhifang
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Article History
Received: 9 May 2019
Accepted: 8 July 2019
First Online: 15 July 2019
Ethics approval and consent to participate
: The study was conducted according to the Declaration of Helsinki and approved by Medical Ethical Committee of the Second Affiliated Hospital of Zhengzhou University. Informed consent was obtained from all patients.
: Not applicable.
: The authors declare that they have no competing interests.
