About the Authors

Jin-Ha Yoon

Affiliations Institute for Occupational Health, Yonsei University College of Medicine, Seoul, Korea, Department of Preventive Medicine, Yonsei University Wonju College of Medicine, Wonju, Korea

Yeon-Soon Ahn

ysahn@dongguk.ac.kr

Affiliation Department of Occupational and Environmental Medicine, Dongguk University Ilsan Hospital, Goyang, Korea

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

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