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