1. Division of Comprehensive Geriatrics in CommunityNiigata University Graduate School of Medical and Dental Sciences Niigata Japan
2. Departments of Nephrology and HypertensionFukushima Medical University Fukushima Japan
3. Committee of Renal Data RegistryJapanese Society for Dialysis Therapy Tokyo Japan
4. Division of Clinical Nephrology and RheumatologyNiigata University Graduate School of Medical and Dental Science Niigata Japan