1. Department of Pathology, Dong-A University College of Medicine, Busan 602-714, Korea.
2. Department of Internal Medicine, Dong-A University College of Medicine, Busan 602-714, Korea.
3. Department of General Surgery, Dong-A University College of Medicine, Busan 602-714, Korea.
4. Department of Radiology, Dong-A University College of Medicine, Busan 602-714, Korea.
5. Department of Parasitology and Tropical Medicine, Seoul National University College of Medicine, Seoul 110-799, Korea.