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Article History
Received: 5 June 2018
Accepted: 15 August 2018
First Online: 3 September 2018
Competing Interests
: The work of Prof. Lin and Miss Wang has been funded by the research project grants from the Ministry of Science and Technology, Taiwan, under grants, MOST 106-2221-E-002-152-MY3, MOST 107-2221-E-002-159-MY3, MOST 107-2221-E-002-158-MY3 and MOST 107-2218-E-992-304-. National Taiwan University pays the salary to Prof. Lin. Other authors declare no competing interests.
