1. Department of Occupational Health Practice and Management, Institute of Industrial Ecological Sciences, University of Occupational and Environmental Health, Japan , Kitakyushu, 807-8555 , Japan
2. Department of Community Medicine, Faculty of Medicine, Universitas Indonesia , Jakarta, 10230, Indonesia
3. Department of Occupational Medicine, School of Medicine, University of Occupational and Environmental Health, Japan , Kitakyushu, 807-8555 , Japan