1Department of Preventive Dentistry and Public Oral Health, Yonsei University, Seoul 120-752, Republic of Korea,
2Research Center for Orofacial Hard Tissue Regeneration, Yonsei University, Seoul 120-752, Republic of Korea,
3Brain Korea 21 project, Yonsei University, College of Dentistry, Yonsei University, Seoul 120-752, Republic of Korea,
4Department of Biotechnology and Bioproducts Research Center, Yonsei University, Seoul 120-752, Republic of Korea
1Department of Preventive Dentistry and Public Oral Health, Yonsei University, Seoul 120-752, Republic of Korea,
2Research Center for Orofacial Hard Tissue Regeneration, Yonsei University, Seoul 120-752, Republic of Korea,
3Brain Korea 21 project, Yonsei University, College of Dentistry, Yonsei University, Seoul 120-752, Republic of Korea,
4Department of Biotechnology and Bioproducts Research Center, Yonsei University, Seoul 120-752, Republic of Korea
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Corresponding author:
Baek-Il Kim , Tel: 82-2-2228-3072,