1. Division of Cardiology, Department of Internal Medicine, Iwate Medical University , 2-1-1 Idaidori, Yahaba-cho, Shiwa-gun, Iwate 028-3695 , Japan
2. Department of Biomedical Information Analysis, Institute for Biomedical Sciences, Iwate Medical University , 2-1-1 Idaidori, Yahaba-cho, Shiwa-gun, Iwate 028-3695 , Japan