1 Division of Nephrology, Department of Internal Medicine, International University of Health and Welfare School of Medicine, 13-1 Higashi-Kaigan-Cho, Atami, Shizuoka, 413-8790, Japan. mtanemoto-tky@umin.ac.jp.
2 Dialysis Unit, Shin-Kuki General Hospital, Saitama, Japan. mtanemoto-tky@umin.ac.jp.
3 Division of Nephrology, Department of Internal Medicine, International University of Health and Welfare School of Medicine, 13-1 Higashi-Kaigan-Cho, Atami, Shizuoka, 413-8790, Japan.
4 Dialysis Unit, Shin-Kuki General Hospital, Saitama, Japan.