1Department of Pediatric Dentistry, School of Dentistry, Dental Science Research Institute and 2nd stage of BK21, Chonnam National University, Gwangju 500-757, Republic of Korea,
2Division of Periodontics, College of Dental Medicine, Columbia University, New York, NY, USA,
3Division of Periodontics, School of Dentistry, Marquette University, Milwaukee, WI, USA,
4Departments of Dental Education and Periodontics, Dental Science Research Institute, School of Dentistry, Chonnam National University, Gwangju 500-757, Republic of Korea
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Corresponding author:
Seok-Woo S. Lee , Tel: +82-62-530-5820,