1. Department of Oral Microbiology
2. Department of Conservative Dentistry, Institute of Health Biosciences, The University of Tokushima Graduate School, 3-18-15 Kuramoto-cho, Tokushima 770–8504, Japan
3. Life Science Products Division, NOF Corporation, 5-10 Tokodai, Tsukuba, Ibaraki 300-2635, Japan
4. Department of Oral Microbiology
miyake@dent.tokushima-u.ac.jp