Affiliation: | 1. Department of Periodontology, Nihon University School of Dentistry at Matsudo, Chiba 271‐8587, Japan;2. Tianjin Stomatology Hospital, Tianjin, China;3. Research Institute of Oral Science, Nihon University School of Dentistry at Matsudo, Chiba 271‐8587, Japan;4. Department of Oral Pathology, Nihon University School of Dentistry at Matsudo, Chiba 271‐8587, Japan;5. Stomatology College of Tianjin Medical University, Tianjin, China |