1. Department of Parasitology and Institute of Endemic Diseases, Seoul National University College of Medicine, Seoul 110-799, Korea.
2. Department of Parasitology, College of Medicine, Hallym University, Chunchon 200-702, Korea.
3. Department of Medical Technology, College of Health Scienses, Yonsei University, Wonju 222-701, Korea.
4. Department of Parasitology, Yonsei University Wonju College of Medicine, Wonju 220-701, Korea.