Expert Global citimpact: 20.75 Researcher at Department of Molecular Cell Biology and Oral Anatomy, Graduate School of Dental Science, Kyushu University, Fukuoka, ; Department of Oral and Maxillofacial Surgery, Faculty of Medicine, Saga University, Saga, ; Division of Histology and Neuroanatomy, Department of Anatomy and Physiology, Faculty of Medicine, Saga University, Saga, ;