1. Department of Preventive Medicine and Public HealthKitasato University School of MedicineJapan
2. Department of Work Systems and HealthThe Institute of Industrial Ecological Sciences, University of Occupational and Environmental HealthJapan
3. Institute for Science of LabourJapan
4. Fukuoka Occupational Health Promotion CentreJapan
5. Department of MicrobiologyUniversity of Occupational and Environmental HealthJapan
6. Department of Occupational HealthGraduate School of Medical Science, Kitasato University School of MedicineJapan