1. Department of Tropical and Endemic Parasitic Diseases, National Institute of Health, Seoul 122-701
2. Department of Molecular Parasitology and Center for Molecular Medicine, Sungkyunkwan University School of Medicine and Samsung Biomedical Research Institute, Suwon 440-746, Korea
3. Department of Parasitology, School of Medicine, Wuhan University, Wuhan 430071
4. State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China