1. Department of Nursing Health Service Research, Graduate School of Health Care Sciences, Tokyo Medical and Dental University, Tokyo 1138510, Japan
2. Health Services Research and Development Center, University of Tsukuba, Tsukuba 3058575, Japan
3. Institute for Global Health Policy Research, Bureau of International Health Cooperation, National Center for Global Health and Medicine, Tokyo 1628655, Japan
4. Diabetes and Metabolism Information Center, Research Institute, National Center for Global Health and Medicine, Tokyo 1628655, Japan
5. Department of Health Services Research, Institute of Medicine, University of Tsukuba, Tsukuba 3058575, Japan