1. Department of Environmental Health, Daejeon Health Institute of Technology, Daejeon, Korea.
2. Department of Preventive Medicine, Soonchunhyang University, Asan, Korea.
3. Department of Medical IT Engineering, College of Medical Sciences, Soonchunhyang University, Asan, Korea.
4. Institute of Occupational and Environmental Medicine, Soonchunhyang University, Asan, Korea.
5. Department of Occupational Health, Daegu Catholic University, Gyeongsan, Korea.
6. Department of Occupational and Environmental Medicine, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, Korea.