1. Department of Parasitology and Tropical Medicine, Seoul National University College of Medicine, and Institute of Endemic Diseases, Seoul National University Medical Research Center, Seoul 110-799, Korea.
2. Department of Parasitology, College of Medicine, Kangwon National University, Chuncheon 200-701, Korea.
3. Seoul National University Bundang Hospital, Gyeonggi-do 463-707, Korea.
4. Department of Parasitology and Institute of Health Sciences, Gyeongsang National University School of Medicine, Jinju 660-751, Korea.
5. Department of Parasitology, College of Medicine, Yonsei University, Seoul 120-752, Korea.
6. Department of Parasitology, College of Medicine, Chungbuk National University, Chongju 361-763, Korea.
7. Department of Microbiology and Immunology, School of Medicine, Eulji University, Daejeon 301-746, Korea.
8. Korea Association of Health Promotion, Seoul 157-704, Korea.
9. Department of Hygiene and Prevention, Ministry of Public Health, Vientiane, Lao PDR.
10. Department of Parasitology, College of Medicine, Korea University, Seoul 136-705, Korea.