1 Department of Nephrology, University of Tsukuba, Ibaraki, Japan.
2 Department of Nephrology and Rheumatology, Kyorin University School of Medicine, Tokyo, Japan.
3 Department of Nephrology, Rheumatology, Endocrinology and Metabolism, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan.
4 Department of Clinical Epidemiology, Kochi Medical School, Kochi University, Kochi, Japan.
5 Department of Rheumatology, Endocrinology and Nephrology, Hokkaido University, Hokkaido, Japan.
6 Department of Nephrology, Tokyo Metropolitan Geriatric Hospital, Tokyo, Japan.
7 Department of Nephrology, Kyoto University, Kyoto, Japan.
8 Department of Nephrology and Dialysis, Kitano Hospital, Osaka, Japan.
9 Department of Nephrology and Blood Purification, Kidney Disease Center, Tokyo Medical University Hachioji Medical Center, Tokyo, Japan.
10 Department of Nephrology, Wakayama Medical University, Wakayama, Japan.
11 Division of Internal Medicine, National Hospital Organization Kanazawa Medical Center, Ishiskawa, Japan.
12 Division of Nephrology, Endocrinology, and Vascular Medicine, Tohoku University Graduate School of Medicine, Miyagi, Japan.
13 Center for General Medicine Education, Keio University School of Medicine, Tokyo, Japan.
14 Department of Nephrology and Rheumatology, Gunma University Graduate School of Medicine, Gunma, Japan.
15 Department of Nephrology, Tokyo Medical University Ibaraki Medical Center, Ibaraki, Japan.
16 Department of Nephrology, Fujita Health University School of Medicine, Aichi, Japan.
17 Division of Nephrology and Endocrinology, Tohoku Medical and Pharmaceutical University, Miyagi, Japan.
18 Department of Nephrology, Kanazawa Medical University, Ishikawa, Japan.
19 Department of Nephrology, Saitama Medical University, Saitama, Japan. hirookda@saitama-med.ac.jp.
20 Division of Clinical Nephrology and Rheumatology, Niigata University, Niigata, Japan.