1. Juntendo University, Graduate School of Medicine, Global Health Research/Faculty of International Liberal Arts, Global Health Services 2-1-1 Hongo, Bunkyo-Ku, Tokyo 113-8421, Japan
2. Institute for Educational Research and Service, International Christian University
3. Teikyo University Graduate School of Public Health, 2-11-1 Kaga, Itabashi-ku, Tokyo, Japan