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Authors
Liu, Chun Hua
Jing, Xue Ning
Liu, Xiao Lan
Qin, Shan Yong
Liu, Min Wei
Hou, Chun Hong
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Article History
Received: 2 April 2020
Accepted: 30 July 2020
First Online: 11 August 2020
Ethics approval and consent to participate
: This research was approved by the Ethics Committee of Heze Municipal Hospital and in accordance with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Informed consent was obtained before this research.
: Not applicable.
: The authors declare that they have no competing interests.
