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Authors
Chai, Guorong
He, Hua
Su, Yana
Sha, Yongzhong
Zong, Shengliang
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Funding
Funding for this research was provided by:
National Natural Science Foundation of China (71472079, 71861026)
Key Project of China Ministry of Education for Philosophy and Social Science (16JZD023)
China Postdoctoral Science Foundation (2016M600827)
Chengguan District of Lanzhou City (No.2018-7-10)
Natural Science Foundation of Gansu Province, China (18JR3RA354)
the Fundamental Research Funds for the Central Universities of Lanzhou University (No. 18LZUJBWZD07)
Belt and Road Special Project of Lanzhou University (No. 2018ldbryb026)
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Article History
Received: 16 September 2018
Revised: 16 August 2019
Accepted: 27 August 2019
First Online: 14 October 2019
Compliance with ethical standards
: This study involves human participants but is not a survey or observation of human behavior. 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. For this type of study, formal consent is not required. This study complies with the current laws in China.
: The authors declare that they have no competing interests.
