1. Department of Parasitology, School of Medicine, Pusan National University, Busan, 602-739, Korea.
2. Department of Microbiology and Immunology, School of Medicine, Pusan National University, Busan, 602-739, Korea.
3. Pusan National University Hospital Medical Research Institute, Busan 602-739, Korea.
4. Department of Ophthalmology, School of Medicine, Pusan National University, Busan, 602-739, Korea.
5. Department of Nursing, College of Nursing, Pusan National University, Busan, 602-739, Korea.
6. Department of Parasitology, School of Medicine, Kyungpook National University, Daegu 700-422, Korea.