1. Shizuoka Health Care CenterCentral Japan Railway CompanyJapan
2. Department of PsychiatrySchool of Medicine, University of Occupational and Environmental HealthJapan
3. Health Care CenterCentral Japan Railway CompanyJapan
4. Department of Preventive Medicine, Faculty of Medical SciencesKyushu UniversityJapan
5. Department of Occupational PneumologyInstitute of Industrial Ecological Sciences, University of Occupational and Environmental HealthJapan