About the Authors

Koji Wada

kwada-sgy@umin.ac.jp

Affiliation International Health Cooperation, National Center for Global Health and Medicine, Tokyo, Japan

Yoshiyuki Higuchi

Affiliation Department of Health and Physical Education, Fukuoka University of Education, Fukuoka, Japan

Derek R. Smith

Affiliation School of Health Sciences, Faculty of Health and Medicine, University of Newcastle, Ourimbah, New South Wales, Australia

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: KW YH. Performed the experiments: KW YH. Analyzed the data: KW YH. Contributed reagents/materials/analysis tools: KW YH. Wrote the paper: KW DRS.