1. Department of Internal Medicine, Wonkwang University School of Medicine, Iksan, Korea.
2. Department of Pathology, Wonkwang University School of Medicine, Iksan, Korea.
3. Department of Radiology, Wonkwang University School of Medicine, Iksan, Korea.
4. Department of Thoracic and Cardiovascular Surgery, Wonkwang University School of Medicine, Iksan, Korea.