1. Division of Clinical Medicine, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
2. Department of General Medicine and Primary Care, University of Tsukuba Hospital, Tsukuba, Japan
3. Department of General Internal Medicine, Akashi Medical Center, Akashi, Japan
4. Aketo-otsuka clinic, Japan
5. Tokyo Hokuto Medical cooperative association Oji co-op hospital, Japan
6. Kensei Kuroishi Clinic, Japan
7. Department of Community Medicine, Kitasato University School of Medicine, Japan
8. Department of Palliative Medicine, Saku Central Hospital Advanced Care Center, Japan