1. Department of Parasitology and Tropical Medicine, Institute of Endemic Diseases, Seoul National University College of Medicine, Seoul 110-799, Korea.
2. Department of Schistosomiasis Control, Guangxi Center for Disease Control and Prevention, Nanning, Guangxi, 530028 China.
3. Department of Parasitology, Keimyung University College of Medicine, Daegu 700-310, Korea.
4. Department of Parasitology, Yanbian University College of Medicine, Yanji, Jilin, 133000 China.