1. Department of Periodontology, Research Institute for Periodontal Regeneration, College of Dentistry, Yonsei University, Seoul, Korea.
2. Department of Periodontology, College of Dentistry, Dankook University, Cheonan, Korea.
3. Department of Neurosurgery, Naeun Hospital, Anyang, Korea.
4. Biomedical Research Institute, iBMT Co., Ltd., Anyang, Korea.
5. BK21 PLUS Project, Department of Applied Life Science, College of Dentistry, Yonsei University, Seoul, Korea.