1. Innovative Research Institute, R&D Division, Morinaga Milk Industry Co., Ltd., 5-1-83, Higashihara, Zama 252-8583, Japan
2. Department of Public Health and Preventive Medicine, Yamaguchi University Graduate School of Medicine, 1-1-1, Minami-Kogushi, Ube 755-8505, Japan
3. Division of Preventive Medicine, Clinical Research Institute, National Hospital Organization Kyoto Medical Center, 1-1, Fukakusa, Mukaihata-cho, Fushimi-ku, Kyoto 612-8555, Japan