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Authors
Yi, Xu
Yang, Qi-Fan http://orcid.org/0000-0002-7036-1712
Zhang, Xueyue
Yang, Ki Youl http://orcid.org/0000-0002-0587-3201
Li, Xinbai
Vahala, Kerry
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Article History
Received: 24 October 2016
Accepted: 6 February 2017
First Online: 23 March 2017
Competing interests
: The authors declare no competing financial interests.
