1. Department of Veterinary Parasitology, Jeju National University College of Veterinary Medicine, Jeju 690-756, Korea.
2. Department of Science Education, Jeju National University College of Education, Jeju 690-756, Korea.
3. Division of Malaria and Parasitic Diseases, National Institute of Health, Centers for Disease Control and Prevention, Osong 363-951, Korea.
4. Department of Parasitology and Institute of Health Sciences, Gyeongsang National University School of Medicine, Jinju 660-751, Korea.