1. Department of Internal Medicine, Dong-A University College of Medicine, Busan 602-714, Korea.
2. Korea Human Resource Development Institute for Health and Welfare, Seoul 122-701, Korea.
3. Department of Internal Medicine, Yonsei University College of Medicine, Seoul 120-752, Korea.
4. Department of Bioscience and Biotechnology, Sejong University, Seoul 143-747, Korea.
5. Department of Pathology and Medical Research Center for Cancer Molecular Therapy, Dong-A University College of Medicine, Busan 602-714, Korea.