1. Department of Dental Pharmacology, School of Dentistry, and Institute of Oral Bioscience, Brain Korea 21 Project, Chonbuk National University, Jeon-Ju 561-756, Korea.
2. College of Pharmacy, Woosuk University, Sam-Rye 565-701, Korea.
3. Department of Pathology, School of Medicine, Chonbuk National University, Jeon-Ju 561-756, Korea.
4. Department of Oral Pathology, School of Dentistry, Chonbuk National University, Jeon-Ju 561-756, Korea.
5. Department of Dental Biomaterials, School of Dentistry, Chonbuk National University, Jeon-Ju 561-756, Korea.
6. Department of Materials Science and Metallurgical Engineering, Sunchon National University, Sunchon 540-742, Korea.