1. Takemi Program in International Health, Harvard T. H. Chan School of Public Health, Boston, Massachusetts
2. Department of Public Health, Graduate School of Medicine, University of Tokyo, Tokyo, Japan
3. Department of Health Services Research, Faculty of Medicine, University of Tsukuba, Ibaraki, Japan
4. Department of Social and Behavioral Sciences, Harvard T. H. Chan School of Public Health, Boston, Massachusetts
5. Health Services Research and Development Center, University of Tsukuba, Ibaraki, Japan