1. Department of Internal Medicine and Biochemistry and Cell Biology, Kyungpook National University School of Medicine, Daegu, 700-721, Korea.
2. Department of Microbiology, Keimyung University, Daegu 704-701, Korea.
3. Department of Biochemistry and Cell Biology, Kyungpook National University School of Medicine, Daegu 700-721, Korea.
4. Biomedical Research Institute, Department of Medical and Biological Engineering, Kyungpook National University School of Medicine, Daegu 700-721, Korea.
5. Department of Internal Medicine, Kyungpook National University School of Medicine, Daegu 700-721, Korea.