1. Department of Parasitology and Tropical Medicine, Seoul National University College of Medicine, and Institute of Endemic Disease, Seoul National University Medical Research Center, Seoul 110-799, Korea.
2. Department of Environmental Medical Biology, Yonsei University College of Medicine, Seoul 120-752, Korea.
3. Department of Anatomy, College of Medicine, Korea University, Brain Korea 21, Seoul 136-705, Korea.
4. Divison of Infection and Immunology, Graduate School of Medicine, Korea University, Seoul 136-701, Korea.
5. Department of Parasitology, Graduate School of Medicine, Gunma University, Maebashi 371-8581, Japan.
6. Department of Parasitology, Graduate School of Medical Sciences, Kyushu University, Fukuoka 812-8582, Japan.
7. Seoul National University Bundang Hospital, Seongnam 463-707, Korea.