1. Department of Healthcare Economics and Quality Management , Graduate School of Medicine, Kyoto University, Yoshida Konoe-cho, Sakyo-ku, Kyoto City, Kyoto 606-8501, Japan
2. International Institute of Socio-Epidemiology , Kyoto 606-8336, Japan
3. Applied Sports, Technology and Medicine Research Centre , Faculty of Science and Engineering, Swansea University, Swansea, UK
4. Unit for Global Health, Centre for the Promotion of Interdisciplinary Education and Research, Kyoto University , Yoshida Hon-Machi, Sakyo-ku, Kyoto 606-8501, Japan