1Department of Microbiology, School of Medicine, Chonnam National University, Gwangju 501-746, Republic of Korea,
2Department of Pediatric Dentistry, School of Dentistry, Chonnam National University, Gwangju 500-757, Republic of Korea,
3Brain Korea 21 Program, Chonnam National University, Gwangju 500-757, Republic of Korea,
4Dental Science Research Institute, Chonnam National University, Gwangju 500-757, Republic of Korea
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Corresponding author:
Seon-Mi Kim , Tel: 82-62-530-5826,