1. Department of Diagnostic Radiology, Yonsei University College of Medicine, Seoul 120-752, Korea.
2. Institute of Gastroenterology, Yonsei University College of Medicine, Seoul 120-752, Korea.
3. Department of Nuclear Medicine, Yonsei University College of Medicine, Seoul 120-752, Korea.
4. Department of Nuclear Medicine, Hallym University College of Medicine, Anyang 431-070, Korea.
5. Department of Surgery, Yonsei University College of Medicine, Seoul 120-752, Korea.