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Authors
Kang, Jian
Lim, Liangzhong
Song, Jianxing
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Funding
Funding for this research was provided by:
Ministry of Education of Singapore
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Article History
Received: 4 February 2019
Accepted: 15 May 2019
First Online: 20 June 2019
Competing interests
: The authors declare no competing interests.
