1. Department of Histology and Oral Histology; Institute of Biomedical Sciences; Tokushima University Graduate School; Tokushima Japan
2. Department of Periodontology and Endodontology; Institute of Biomedical Sciences; Tokushima University Graduate School; Tokushima Japan
3. Department of Basic Science; School of Veterinary Nursing and Technology; Faculty of Veterinary Science; Nippon Veterinary and Life Science University; Musashino Tokyo Japan
4. Department of Anatomy; School of Medicine; University of Occupational and Environmental Health; Kitakyushu Japan