Daisuke Sakai,¹ Noburu Sensui,² Euichi Hirose<sup>3,*

1</sup>School of Regional Innovation and Social Design Engineering, Kitami Institute of Technology, Kitami, Hokkaido 090-8507, Japan
²Department of Human Biology and Anatomy, Graduate School of Medicine, University of the Ryukyus, Nishihara, Okinawa 903-0215, Japan
³Department of Chemistry, Biology and Marine Science, Faculty of Science, University of the Ryukyus, Nishihara, Okinawa 903-0213, Japan

^*Corresponding author. E-mail: euichi@sci.u-ryukyu.ac.jp