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