1. Department of Endodontics, Nihon University School of Dentistry, Chiyoda-ku, Tokyo, Japan
2. Division of Advanced Dental Treatment, Dental Research Center, Nihon University School of Dentistry, Tokyo, Japan
3. Department of Oral Diagnostic Sciences, Nihon University School of Dentistry, Chiyoda-ku, Tokyo, Japan
4. Division of Clinical Research, Dental Research Center, Nihon University School of Dentistry, Tokyo, Japan
5. Department of Physiology, Nihon University School of Dentistry, Chiyoda-ku, Tokyo, Japan
6. Division of Functional Morphology, Dental Research Center, Nihon University School of Dentistry, Tokyo, Japan