1. Department of Anatomy and Cell Biology, Faculty of Medicine; Osaka Medical College; Takatsuki Osaka Japan
2. Division of Functional Morphology, Department of Basic Veterinary Medicine, School of Veterinary Medicine; Nippon Veterinary and Life Science University; Musashino Tokyo Japan
3. Department of Animal Science, Graduate School of Environmental and Life Science; Okayama University; Okayama Japan
4. Division of Research and Treatment for Oral and Maxillofacial Congenital Anomalies, School of Dentistry; Aichi-Gakuin University; Nagoya Aichi Japan
5. Department of Oral Histology, School of Dentistry; Matsumoto Dental University; Shiojiri Nagano Japan
6. Osaka Medical College; Takatsuki Osaka Japan