1. Department of Occupational Health Practice and Management, Institute of Industrial Ecological Sciences, University of Occupational and Environmental Health , Kitakyushu, Japan
2. Institutional Research Center, University of Occupational and Environmental Health , Kitakyushu, Japan
3. Department of Community Medicine, Faculty of Medicine, Universitas Indonesia , Jakarta, Indonesia
4. Wilhelm Wundt Institute of Psychology, Leipzig University , Leipzig, Germany