1. Department of Internal Medicine, College of Medicine, Soon Chun Hyang University, Seoul, Korea.
2. Department of Internal Medicine, College of Medicine, Chungang University, Seoul, Korea.
3. Department of Internal Medicine, College of Medicine, Yonsei University, Seoul, Korea.
4. Department of Internal Medicine, College of Medicine, Hanyang University, Seoul, Korea.
5. Department of Internal Medicine, College of Medicine, Hallym University, Seoul, Korea.
6. Department of Internal Medicine, College of Medicine, Chonbuk National University, Jeonju, Korea.
7. Department of Internal Medicine, College of Medicine, Inha University, Incheon, Korea.
8. Aventis Pharma Korea, Seoul, Korea.