1. Department of Dental Pharmacology, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama, Japan.
2. Advanced Research Center for Oral and Craniofacial Sciences, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama, Japan.
3. Research Program for Undergraduate Students, Okayama University Dental School, Okayama, Japan.
4. Department of Dental Pharmacology, Matsumoto Dental University, Shiojiri, Japan.