1. Department of Ubiquitous Health Informatics, Graduate School of Medicine, the University of Tokyo, Japan
2. Department of Diabetes and Metabolic Diseases, Graduate School of Medicine, The University of Tokyo, Japan
3. Center for Knowledge Structuring, The University of Tokyo, Japan
4. Frontier Services Department, NTT DOCOMO, INC., Japan
5. Department of Medical Informatics and Economics, Graduate School of Social Medicine, The University of Tokyo, Japan