Taira, Wataru
Toki, Mariko
Kakinohana, Keisuke
Sakauchi, Ko
Otaki, Joji M.
Funding for this research was provided by:
University of the Ryukyus Donations from the public
Article History
Received: 13 July 2018
Accepted: 4 December 2018
First Online: 22 February 2019
Competing Interests
: The authors declare no competing interests.