Received: 13 September 2018
Accepted: 14 May 2019
First Online: 22 May 2019
Ethics approval and consent to participate
: Our study was approved by the Animal Care and Use Committee at Bethune International Peace Hospital (Shijiazhuang, Hebei, China). The experiment was carried out in accordance with the Code of Ethics of the World Medical Association (Declaration of Helsinki).
: No such data included.
: The authors declare that they have no competing interests.
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