Funding for this research was provided by:
National Natural Science Foundation of China (G0501200151472044)
Chongqing BOE Optoelectronics (CQ1610-PM-IP-001)
Text and Data Mining valid from 2019-05-16
Received: 26 December 2018
Accepted: 6 May 2019
First Online: 16 May 2019
: The authors declare that they have no competing interests.
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