1. Department of Internal Medicine, Wonkwang University College of Medicine, Iksan, Korea.
2. Department of Thoracic Surgery, Wonkwang University College of Medicine, Iksan, Korea.
3. Department of Nuclear Medicine, Wonkwang University College of Medicine, Iksan, Korea.
4. Department of Therapeutic Radiology & Oncology, Wonkwang University College of Medicine, Iksan, Korea.
5. Department of Pathology, Wonkwang University College of Medicine, Iksan, Korea.