1. Department of Parasitology, School of Medicine, Pusan National University, Yangsan 626-813, Korea.
2. Healthy Jang's Internal Medicine, Busan 612-804, Korea.
3. Department of Parasitology, Institute of Health Sciences, Gyeongsang National University School of Medicine, Jinju 660-751, Korea.
4. Department of Microbiology and Immunology, School of Medicine, Pusan National University, Yangsan 626-813, Korea.
5. Department of Nursing, College of Nursing, Pusan National University, Busan 626-813, Korea.