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Authors
Wu, H. C.
Wei, T. Y.
Chandrasekhar, K. D.
Chen, T. Y.
Berger, H.
Yang, H. D.
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Article History
Received: 28 April 2015
Accepted: 31 July 2015
First Online: 9 September 2015
Competing interests
: The authors declare no competing financial interests.
