1. Department of Preventive Medicine and Medical Research Institute, College of Medicine, Chungbuk National University, Cheongju, Chungbuk, South Korea
2. Department of Preventive Medicine, School of Medicine, Konkuk University, Chungju, Chungbuk, South Korea
3. Department of Preventive Medicine, College of Medicine, Chungang University, Seoul, South Korea
4. Environmental Epidemiology Division, Environmental Health Research Department, National Institute of Environmental Research, Incheon, South Korea
5. Department of Environmental Management, School of Health Sciences and University of Occupational and Environmental Health, Kitakyushu, Fukuoka, Japan
6. Environmental Health, School of Medicine, University of Occupational and Environmental Health, Kitakyushu, Fukuoka, Japan
7. Department of Preventive Medicine and Medical Research Institute, College of Medicine, Chungbuk National University, Cheongju, Chungbuk, South Korea,