1. Department of Parasitology and Tropical Medicine, and Institute of Endemic Diseases, Seoul National University College of Medicine and Medical Research Center, Seoul 110-799, Korea.
2. Department of Therapeutic Radiology, Chungbuk National University College of Medicine, Cheongju 361-763, Korea.
3. Department of Parasitology, College of Medicine, Konkuk University, Chungju 380-701, Korea.