1. Department of Preventive Medicine, Wonju College of Medicine, Yonsei University, Gangwon-do, Korea.
2. Research Institute of Health & Environment, Gangwon-Do, Korea.
3. Environment & Welfare Bureau, Gangwon-Do, Korea.
4. Department of Pediatrics, Wonju College of Medicine, Yonsei University, Gangwon-do, Korea.
5. Department of Biological Resources and Technology, Yonsei University, Wonju, Korea.
6. Korea National Institute of Health, Seoul, Korea.
7. Department of Microbiology, Wonju College of Medicine, Yonsei University, Gangwon-do, Korea.