1. Dialysis Center; Kawakita General Hospital; Tokyo
2. Nakano Clinic; Tokyo
3. Department of Nephrology; Tokyo Metropolitan Police Hospital; Tokyo
4. Shinjuku Ishikawa Clinic; Tokyo
5. Department of Nephrology; Japanese Red Cross Musashino Hospital; Tokyo
6. Asagaya Suzuki Clinic; Tokyo
7. Kichijoji Asahi Hospital; Tokyo; Japan