1. Department of Probiotic Science for Preventive Medicine
2. Department of Pharmacognosy
3. Faculty of Dentistry, Graduate School of Biomedical and Health Sciences, Hiroshima University, Kasumi 1-2-3, Minami-ku, Hiroshima 734-8551, Japan
4. Asahi Kohsan Co., Ltd., Shinjuku 1-1-14, Shinjuku-ku, Tokyo 160-0022, Japan