1. Department of Translational Research, Tsurumi University School of Dental Medicine, 2-1-3 Tsurumi Tsurumi-ku, Yokohama 230-8501, Japan
2. Department of Oral Microbiology, Tsurumi University School of Dental Medicine, 2-1-3 Tsurumi Tsurumi-ku, Yokohama 230-8501, Japan
3. Department of Operative Dentistry, Tsurumi University School of Dental Medicine, 2-1-3 Tsurumi Tsurumi-ku, Yokohama 230-8501, Japan
4. Iwate Dental Association, 2-5-25 Morioka-eki-Nishi-dori, Morioka 020-0045, Japan