1. College of Medicine, Chung-Ang University, Seoul
2. Environmental Epidemiology Division, Environment Health Research Department, National Institute of Environment Research, Incheon
3. Advanced Analysis Center, Korea Institute of Science and Technology, Seoul
4. College of Medicine, Kwandong University, Gangwon
5. College of Medicine, Chungbuk National University, Chungbuk
6. Hoseo University, Asan