1. Department of Molecular Parasitology and Center for Molecular Medicine Sungkyunkwan University School of Medicine and Samsung Biomedical Research Institute, Suwon 440-746, Korea.
2. Department of Tropical and Endemic Parasitic Diseases, National Institute of Health, Seoul 122-701, Korea.
3. Bureau of Health Promotion, Ministry of Health and Welfare, Gwacheon 427-721, Korea.