1. Clinical Research Center, Inje University Ilsan Paik Hospital, Gyeonggi province 411-706, Korea.
2. Department of Pathology, Inje University Ilsan Paik Hospital, Gyeonggi province 411-706, Korea.
3. Department of Parasitology and Tropical Medicine, College of Medicine, Seoul National University, and Institute of Endemic Diseases, Seoul National University Medical Research Center, Seoul 110-799, Korea.