About the Authors

Mo-Yeol Kang

Affiliations Occupational Safety and Health Research Institute, Korea Occupational Safety and Health Agency, Ulsan, South Korea, Department of Preventive Medicine, Seoul National University College of Medicine, Seoul, South Korea

Hyoung-Ryoul Kim

cyclor@catholic.ac.kr

Affiliation Department of Occupational and Environmental Medicine, College of Medicine, the Catholic University of Korea, Seoul, South Korea

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: HRK MYK. Performed the experiments: HRK MYK. Analyzed the data: HRK MYK. Contributed reagents/materials/analysis tools: HRK MYK. Wrote the paper: HRK MYK.