1Department of Periodontology, College of Dentistry, Chosun University, Korea.
2Department of Oral and Maxillofacial Surgery, College of Dentistry, Chosun University, Korea.
3Department of Oral Histology, College of Dentistry, Chosun University, Korea.
4Oral Biology Research Institute, Chosun University, Korea.
Corresponding author: Byung-Ock Kim, Department of Periodontology, College of Dentistry, Chosun University, 421 Seoseok-Dong, Dong-Ku, Gwang-ju, 501-759, Korea, Tel: +82-62-220-3856, Fax: +82-62-224-4664, bobkim@chosun.ac.kr