1. Division of Malaria and Parasitic Diseases, National Institute of Health, Centers for Disease Control and Prevention, Osong 363-951, Korea.
2. Department of Parasitology and Inha Research Institute for Medical Sciences, Inha University College of Medicine, Incheon 400-712, Korea.
3. Department of Parasitology and Institute of Health Sciences, Gyeongsang National University School of Medicine, Jinju 660-751, Korea.