1. Department of Internal Medicine, Gachon University Gil Medical Center, Incheon, Korea.
2. Depatment of Internal Medicine, School of Medicine, Gachon University, Incheon, Korea.
3. Gachon Medical Research Institute, Gachon University Gil Medical Center, Incheon, Korea.
4. Department of Surgery, Gachon University Gil Medical Center, Gachon University School of Medicine, Incheon, Korea.
5. Department of Pathology, Gachon University Gil Medical Center, Gachon University School of Medicine, Incheon, Korea.