1. Department of Molecular Genetics and Dental Pharmacology and Therapeutics, School of Dentistry and Dental Research Institute, BK21 Program, Seoul National University, Seoul, 088-26, Republic of Korea
2. Department of Periodontology, School of Dentistry, Seoul National University, Seoul 110-749, Republic of Korea
3. Department of Plastic and Reconstructive Surgery, School of Medicine, Kyungpook National University, Daegu, Republic of Korea