1. Department of Parasitology, Korea University College of Medicine, Seoul 136-701, Korea.
2. Department of Parasitology and Institute of Endemic Diseases, Seoul National University College of Medicine, Seoul 110-799, Korea.
3. Department of Parasitology and Institute of Health Science, Gyongsang National University College of Medicine, Jinju 660-751, Korea.
4. Department of Diagnostic Radiology College of Medicine, Dankook University, Cheonan 330-714, Korea.
5. Department of Environmental and Tropical Medicine, Konkuk University, School of Medicine, Chungju 380-701, Korea.
6. Department of Parasitology, College of Medicine, Dankook University, Cheonan 330-714, Korea.