1. Division of Nephrology and Endocrinology, The University of Tokyo School of Medicine, Japan
2. Division of Nephrology, Department of Medicine, Japanese Red Cross Medical Center, Tokyo, Japan
3. Department of Clinical Laboratory Medicine, Juntendo University Graduate School of Medicine, Tokyo, Japan
4. Clinical Research Support Center, The University of Tokyo Hospital, Japan
5. Nishi Clinic, Tokyo, Japan
6. Akihabara Izumi Clinic, Tokyo, Japan
7. Nonaka Clinic, Tokyo, Japan
8. Deceased.
9. Division of Nephrology, Department of Medicine, Mitsui Memorial Hospital, Tokyo, Japan