1 Department of Internal Medicine, Division of Kidney and Dialysis, Hyogo College of Medicine, 1-1, Mukogawa-Cho, Nishinomiya, 663-8501, Japan. nagasawa@hyo-med.ac.jp.
2 Department of Internal Medicine, Division of Kidney and Dialysis, Hyogo College of Medicine, 1-1, Mukogawa-Cho, Nishinomiya, 663-8501, Japan.