From the Department of Occupational Health Practice and Management, Institute of Industrial Ecological Sciences, University of Occupational and Environmental Health, Kitakyushu, Japan (Dr Mori, Dr Nagata, Dr Odagami, Dr Mori); and Department of Occupational Medicine, School of Medicine, University of Occupational and Environmental Health, Japan, Kitakyushu, Japan (Dr Nagata).
Ethical Considerations and Disclosures: The research protocol was approved by the Ethics Committee of Medical Research, University of Occupational and Environmental Health, Kitakyushu, Japan (H26-026).
Funding sources: This study was funded by the consigned research foundation (the Collabo-health Study Group).
Conflict of interest: None declared.
Address correspondence to: Takahiro Mori, MD, MOH, Department of Occupational Health Practice and Management, Institute of Industrial Ecological Sciences, University of Occupational and Environmental Health, 1-1 Iseigaoka, Yahatanishi-ku, Kitakyushu 807-8555, Japan ([email protected]).
