1. Division of Cardiovascular Medicine, Department of Medicine, Kurume University School of Medicine, Kurume, Japan.
2. Division of Bioscience and Bioenvironmental Sciences, Faculty of Agriculture, Graduate School of Kyushu University, Fukuoka, Japan.
3. Department of Pathophysiology and Therapeutics of Diabetic Vascular Complications, Kurume University School of Medicine, Kurume, Japan.