1. Department of Radiology and Center for Imaging Science, Korea.
2. Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul 135-710, Korea.
3. Department of Laboratory Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul 135-710, Korea.
4. Department of Parasitology, College of Medicine, Hallym University, Chuncheon 200-702, Korea.