1. Department of Nutritional Science, Okayama Prefectural University, 111 Kuboki, Soja, Okayama 719-1197, Japan
2. Department of Nutrition and Life Science, Fukuyama University, 985-1 Sanzo, Higashimura-cho, Fukuyama 729-0292, Japan
3. The Faculty of Food Culture, Kurashiki Sakuyo University, 3515 Tamashima Nagao, Kurashiki, Okayama 710-0292, Japan