1. Department of Occupational and Environmental Medicine, Ajou University Hospital, Suwon, Korea.
2. Department of Occupational and Environmental Medicine, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, Korea.
3. Department of Preventive Medicine and Genomic Cohort Institute, Yonsei University Wonju College of Medicine, Wonju, Korea.
4. Department of Family Medicine, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, Korea.
5. Department of Occupational and Environmental Medicine, Wonju Severance Christian Hospital, Wonju, Korea.