1. Department of Pathology and BK21 for Medical Science, Yonsei University College of Medicine, Seoul, Korea
2. Severance Biomedical Science Institute and BK21 for Medical Science, Yonsei University College of Medicine, Seoul, Korea
3. Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea
4. Department of Surgery, Yonsei University College of Medicine, Seoul, Korea