Erratum

After publication of the original article [1] the authors found that the following affiliations were incorrect at the time of publication:

  1. 1.

    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