Department of Nutritional Sciences, Faculty of Nutritional Sciences, Nakamura Gakuen University, Fukuoka, Japan. Department of Food of Health Sciences, International College of Arts and Sciences, Fukuoka Women's University, Fukuoka, Japan. Department of Health and Nutrition Sciences, Faculty of Health and Nutrition Sciences, Nishikyushu University, Kanzaki, Japan. Health Care Center, Fukuoka University, Fukuoka, Japan. Hypertension Center, Steel Memorial Yawata Hospital, Kitakyushu, Japan.