1. Department of Oral and Maxillofacial Biology, Graduate School of Oral Medicine, Matsumoto Dental University, Shiojiri, Japan
2. Department of Oral Anatomy, Matsumoto Dental University, Shiojiri, Japan
3. Department of Dental Pharmacology, Matsumoto Dental University, Shiojiri, Japan
4. Department of Oral Health Promotion, Graduate School of Oral Medicine, Matsumoto Dental University, Shiojiri, Japan