About the Authors

Shin-ichiro Oka

sh-oka@okichura.jp

Affiliation Okinawa Churashima Foundation, 888 Ishikawa, Motobu, Okinawa 905–0206, Japan

Taketeru Tomita

Affiliation Okinawa Churashima Foundation, 888 Ishikawa, Motobu, Okinawa 905–0206, Japan

Kei Miyamoto

Affiliation Okinawa Churashima Foundation, 888 Ishikawa, Motobu, Okinawa 905–0206, Japan

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceptualization: SO TT KM. Data curation: SO TT. Formal analysis: SO TT KM. Investigation: SO TT KM. Methodology: SO TT. Project administration: SO. Validation: SO TT KM. Visualization: SO TT KM. Writing – original draft: SO. Writing – review & editing: SO TT KM.