1. Division of Biliopancreas, Department of Internal Medicine, Wonkwang University College of Medicine, Iksan, Korea
2. Institute of Wonkwang Medical Science, Wonkwang University College of Medicine, Iksan, Korea
3. Department of Pathology, Wonkwang University Hospital, Wonkwang University College of Medicine, Iksan, Korea
4. Department of Radiology, Wonkwang University Hospital, Wonkwang University College of Medicine, Iksan, Korea