1. 1Division of Nephrology, Department of Internal Medicine, Shinmatsudo Central General Hospital, Matsudo, 270-0034, Japan
2. 2Department of Pathophysiology and Therapeutics of Diabetic Vascular Complications, Kurume University School of Medicine, Kurume, 830-0011, Japan
3. 3Department of Chemistry, Keio University School of Medicine, Yokohama, 223-8521, Japan