1. Bonecell Biotech. Inc., Dunsan-dong, Seo-gu, Daejeon 602-830, Republic of Korea
2. Wonkwang Bone Regeneration Institute, Wonkwang University, Iksan 570-749, Republic of Korea
3. Department of Oral & Maxillofacial and Surgery, Wonkwang University Daejeon Dental Hospital, Seo-gu, Daejeon 302-120, Republic of Korea