1. Department of Social and Preventive Medicine, Sungkyunkwan University School of Medicine, Suwon, Korea.
2. Department of Preventive Medicine, Dankook University College of Medicine, Cheonan, Korea.
3. Department of Environmental Health, Graduate School of Public Health, Seoul National University, Seoul, Korea.
4. Department of Preventive Medicine, Ajou University School of Medicine, Suwon, Korea.
5. National Institute of Environmental Research, Incheon, Korea.
6. Masan Samsung Hospital, Sungkyunkwan University School of Medicine, Masan, Korea.
7. Changwon Fatima Hospital, Changwon, Korea.
8. Eulji University Hospital, Daejeon, Korea.
9. Korean Institute of Science and Technology, Seoul, Korea.
10. Catholic University of Daegu, Daegu, Korea.
11. Department of Preventive Medicine, Seoul National University College of Medicine, Seoul, Korea.