1. Department of Clinical Epidemiology and Health Economics, School of Public Health, The University of Tokyo, Tokyo, Japan
2. Global Health Nursing, Graduate School of Biomedical and Health Sciences, Hiroshima University, Higashihiroshima, Japan
3. Department of Health Services Research, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
4. Department of Health Services Research, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
5. Department of Biostatistics, Division of Health Sciences and Nursing, The University of Tokyo, Tokyo, Japan
6. Department of Health Policy and Informatics, Tokyo Medical and Dental University Graduate School of Medicine, Tokyo, Japan