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Article History
Received: 19 January 2017
Accepted: 19 April 2017
First Online: 5 June 2017
Competing Interests
: The authors S.K., J.W. and S.N. are employees of Nippon Telegraph and Telephone Communication Science Laboratories, which is a basic-science research section of Nippon Telegraph and Telecommunication. There are no patents, products in development or marketed products to declare.
