Affiliation: | a Department of Occupational and Environmental Medicine, Graduate School of Medicine, Chiba University, Chiba, 1-8-1, Inohana, Chuoku, Chiba 260-8670, Japan;b Department of Community Health Nursing, Kanazawa University School of Health Sciences, 5-11-80 Kodatsuno, Ishikawa 920-0942, Japan;c Department of Epidemiology and Public Health, Kanazawa Medical University, 1-1 Daigaku, Uchnada, Ishikawa 920-0293, Japan |