1. Department of Periodontology, Gangnam Severance Hospital, Yonsei University College of Dentistry, Seoul, Korea.
2. Department of Periodontology, Research Institute for Periodontal Regeneration, Yonsei University College of Dentistry, Seoul, Korea.
3. Innovation Research and Support Center for Dental Science, Yonsei University Dental Hospital, Seoul, Korea.
4. Department of Oral Biology, BK21 PLUS Project, Yonsei University College of Dentistry, Seoul, Korea.
5. Department of Oral Histology and Developmental Biology, School of Dentistry and Dental Research Institute, Seoul National University, Seoul, Korea.