*Shinkichi Nishihara1,2, Sumitaka Kobayashi2,3, Mariko Itoh2, Satoshi Suyama4, Reiko Kishi2
(1. Faculty of Education Department of Psychology and Education, Tokoha University., 2. Hokkaido University Center for Environmental and Health Sciences., 3. National Institute of Occupational Safety and Health, Japan, 4. Hokkaido university hospital Center for child mental health and development )
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