1. Department of Parasitology, College of Medicine, Hallym University, Chunchon 200-702, Korea.
2. Department of Parasitology, College of Medicine, Kangwon Branch of the Korea Association of Health, Chunchon, Korea.
3. Section of Molecular Parasitology, Department of Molecular Cell Biology, Sungkyunkwan University School of Medicine, Suwon, Korea.