Erratum
After publication of the original article [1] the authors found that the following affiliations were incorrect at the time of publication:
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Jun-Pyo Myong
The current affiliation,’ Occupational Safety and Health Research Institute, Korea Occupational Safety and Health Agency’ is incorrect.The corrected affiliation should be:Department of Occupational and Environmental Medicine, Seoul St. Mary’s Hospital, College of Medicine, Catholic University of Korea, Seoul, Republic of Korea