1. Department of Parasitology, Kangwon National University College of Medicine, Chunchon 200-701, Korea.
2. Korea Center for Disease Control and Prevention, Seoul 122-701, Korea.
3. Department of Epidemic and Pandemic Alert and Response, World Health Organization, Geneva 1290, Switzerland.
4. Kangwon Institute of Health and Environment, Chunchon 200-822, Korea.
5. Cell-free Science and Technology Research Center, Ehime University, Matsuyama 790-8577, Japan.
6. 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.