Institution: | aDepartment of Periodontology, Nihon University School of Dentistry at Matsudo, Matsudo, Japan;bResearch Institute of Oral Science, Nihon University School of Dentistry at Matsudo, Japan;cDepartment of Histology, Nihon University School of Dentistry at Matsudo, Matsudo, Japan;dFaculty of Dentistry, University of Toronto, Toronto, Canada |