1. Division of Health Service Promotion; The University of Tokyo; Tokyo Japan
2. Department of Nephrology; Tokyo Kyosai Hospital; Tokyo Japan
3. Life Science and Bioethics Center; Tokyo Medical and Dental University; Tokyo Japan
4. Okinawa Heart and Renal Association, Clinical Research Support Center; Tomishiro Central Hospital; Okinawa Japan
5. Department of Nephrology and Hypertension; Kawasaki Medical School; Okayama Japan
6. Division of Nephrology and Endocrinology, Graduate School of Medicine; The University of Tokyo; Tokyo Japan