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Authors
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Funding
Funding for this research was provided by:
the Special Fund Projects for Basic Scientific Research Expenses in Central Colleges and Universities (2015QZ04)
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Article History
Received: 25 February 2020
Accepted: 28 January 2021
First Online: 9 February 2021
Ethics approval and consent to participate
: All research procedures were approved prior to the commencement of the study by the China University of mining and technology (Beijing). All participants signed an informed consent form. Our research received ethics approval from China University of Mining and Technology (Beijing) and it conformed to the ethics guidelines of the Declaration of Helsinki.
: Not Applicable.
: The authors declare that they have no competing interests.
