1. Department of Internal Medicine, Ilsan Paik Hospital, Inje University College of Medicine, Goyang, Korea.
2. Department of Internal Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
3. Department of General Surgery, Ilsan Paik Hospital, Inje University College of Medicine, Goyang, Korea.
4. Department of Pathology, Ilsan Paik Hospital, Inje University College of Medicine, Goyang, Korea.