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Authors
Pan, Xi https://orcid.org/0000-0001-8705-9686
Meng, Hongdao
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Article History
Received: 30 November 2019
Accepted: 21 January 2020
First Online: 13 February 2020
Compliance with ethical standards
:
: The authors declare that they have no competing interests.
: The current study does not contain any studies with animals performed by any of the authors. All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: The current study used the publicly existing data and has obtained approval from the IRB as a project exempted from informed consent.
