1. Department of Clinical Pathology Laboratory Science, Daejeon Health Science College, Daejeon 300-711, Korea.
2. Department of Biochemistry and CBITRC, College of Natural Sciences, Chungbuk National University, Cheongju 361-763, Korea.
3. Water Analysis and Research Center, K-water, Daejeon 306-711, Korea.
4. Bacteriology and Parasitology Division, Animal and Plant Quarantine Agency, Anyang 430-824, Korea.
5. Seoul Metropolitan Government Research Institute of Public Health and Environment, Gwacheon 427-070, Korea.
6. Department of Public Health, Graduate School of Public Health & Social Welfare, Dankook University, Cheonan 330-714, Korea.