1. Department of Pediatric Dentistry, School of Dentistry, Aichi-Gakuin University, Nagoya, Japan.
2. Department of Stem Cell Biology and Regenerative Medicine, National Center for Geriatrics and Gerontology, Research Institute, Obu, Japan.
3. Department of Gerontology and School of Dentistry, Aichi-Gakuin University, Nagoya, Japan.
4. Department of Oral Implantology, School of Dentistry, Aichi-Gakuin University, Nagoya, Japan.
5. Department of Molecular and Developmental Biology, Kawasaki Medical School, Kurashiki, Japan.