Received: 26 September 2018
Accepted: 29 January 2019
First Online: 12 February 2019
Ethics approval and consent to participate
: Studies involving human tissues:This study was approved by the Ethical Committee of the Affiliated Hospital of Hebei Engineering University (HEU2017081121) and it complies with the guidelines and principles of the Declaration of Helsinki. All participants signed written informed consent.
: All participants signed written informed consent for publication.
: The authors declare that they have no competing interests.
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