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Authors
Bian, Fu Cheng http://orcid.org/0000-0003-4277-3039
Cheng, Xiao Kang
An, Yong Sheng http://orcid.org/0000-0002-6547-1706
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Article History
Received: 20 March 2021
Accepted: 11 June 2021
First Online: 23 June 2021
Declarations
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: All procedures performed in studies involving human participants were in accordance with the ethical standards of Chengde Medical University Affiliated Hospital research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.All participants gave their informed consent in writing prior to inclusion in the study.
: All participants agreed with the data and publication of the manuscript.Written informed consent was obtained from all participants.
: The authors declare that they have no competing interests.
