1. Department of Internal Medicine, Yonsei University Wonju College of Medicine, Wonju, Korea.
2. Department of Internal Medicine, Inje University College of Medicine, Seoul, Korea.
3. Regeneration Medicine Research Center, Yonsei University Wonju College of Medicine, Wonju, Korea.
4. Department of Pathology, Yonsei University Wonju College of Medicine, Wonju, Korea.