Yokosaka, Takumi https://orcid.org/0000-0003-3429-744X
Inubushi, Masanobu
Kuroki, Scinob
Watanabe, Junji
Article History
Received: 25 March 2019
Accepted: 4 February 2020
First Online: 20 February 2020
Competing interests
: The authors T.Y., S.K., and J.W. 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.