1. Department of Parasitology and Medical Research Institute, Chungbuk BK21 Biomedical Research Center, Chungbuk National University College of Medicine, Cheongju, Chungbuk 361-763, Korea.
2. Gyeongin Regional Food and Drug Administration, Incheon 402-835, Korea.
3. Department of Parasitology, College of Medicine, Hallym University, Chuncheon 200-702, Korea.
4. Department of Parasitology and Tropical Medicine, Seoul National University College of Medicine, and Institute of Endemic Diseases, Seoul National University Medical Research Center, Seoul 110-799, Korea.
5. Department of Microbiology and Immunology, School of Medicine, Eulji University, Daejeon 301-746, Korea.
6. Department of Parasitology, College of Medicine, Korea University, Seoul 136-705, Korea.