1. Department of Environmental Management and ControlSchool of Health Sciences, University of Occupational and Environmental HealthKitakyushuJapan
2. Department of Occupational ToxicologyUniversity of Occupational and Environmental HealthKitakyushuJapan
3. Department of Immunology and ParasitologySchool of Medicine, University of Occupational and Environmental HealthKitakyushuJapan
4. Division of PharmacologyNational Institute of Health SciencesTokyoJapan