1. Department of Nephroendocrinology, Kojinkai Central Hospital
2. Kidney Center, Shinrakuen Hospital
3. The Second Department of Internal Medicine, Tokyo Medical and Dental University School of Medicine
4. Department of Nephrology, Fujigaoka Hospital, Showa University School of Medicine
5. Department of Pediatrics, Okayama University Medical School
6. Department of Internal Medicine, School of Medicine, Tokai University