1. Department of Periodontology; Graduate School of Medical and Dental Sciences; Tokyo Medical and Dental University; Tokyo Japan
2. Microbe Division/Japan Collection of Microorganisms; RIKEN BioResource Center; Tsukuba Ibaraki Japan
3. Global Center of Excellence (GCOE) Program; International Research Center for Molecular Science in Tooth and Bone Diseases; Tokyo Medical and Dental University; Tokyo Japan