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Authors
Tian, Caihong
Tek Tay, Wee
Feng, Hongqiang
Wang, Ying
Hu, Yongmin
Li, Guoping
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Article History
Received: 19 November 2014
Accepted: 8 May 2015
First Online: 5 June 2015
Competing interests
: The authors declare no competing financial interests.
