1. From the Department of Medicine, International University of Health and Welfare, Minato, Tokyo, Japan (T.T., H.K.)
2. Department of Nephrology, Saitama Medical University, Iruma, Japan (T.I., T.M., H.S.)
3. Department of Pharmacology, Kagawa University, Kita, Japan (A.N.)
4. Department of Clinical Chemistry, Kitasato University, Sagamihara, Kanagawa, Japan (N.I.)
5. Blood Purification Center, Keio University, Shinjuku, Tokyo, Japan (M.H.).