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Authors
Wu, Duzhi https://orcid.org/0000-0001-5866-019X
Hu, Aiping
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Funding
Funding for this research was provided by:
project of Yangtze Upriver Economic Research Center (CJSYI-201806)
the NSF of China (11871124 and 11471060)
Basic Research Program of Chongqing (cstc2018jcyjAX0241)
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Article History
Received: 2 February 2018
Accepted: 26 August 2019
First Online: 11 September 2019
Competing interests
: The authors declare that they have no competing interests.
