1. Department of Dental Regenerative Medicine, Center of Advanced Medicine for Dental and Oral Diseases, National Center for Geriatrics and Gerontology, Research Institute, Obu, Aichi, Japan.
2. Department of Pediatric Dentistry, School of Dentistry, Aichi-gakuin University, Nagoya, Aichi, Japan.
3. Department of Cognitive Brain Science, National Center for Geriatrics and Gerontology, Research Institute, Obu, Aichi, Japan.
4. Department of Developmental Physiology, National Institute for Physiological Sciences, Okazaki, Aichi, Japan.
5. Department of Developmental Anatomy and Regenerative Medicine, National Defense Medical College, Tokorozawa, Saitama, Japan.
6. Department of Endodontology, School of Dentistry, Aichigakuin University, Nagoya, Aichi, Japan.