1. National Institute of Occupational Safety and HealthUSA
2. National Institute for Occupational Safety and HealthUSA
3. Department of NursingSchool of Health Sciences, Ibaraki Prefectural University of Health SciencesJapan
4. Ota Regional Occupational Health CenterGraduate School of Medicine, University of TokyoJapan
5. Department of Public HealthGraduate School of Medicine, University of TokyoJapan