Funding for this research was provided by:
Fundamental Research Funds for the Central Universities (2019kfyXJJS087)
Natural Science Foundation of Fujian Province (2018J01382)
Xiamen Municipal Bureau of Science and Technology (3502Z20174063)
Received: 23 December 2018
Accepted: 7 May 2019
First Online: 4 June 2019
: The authors declare that they have no competing interests.
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