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Yohko KATAKURA
Department of Public Health, Sapporo Medical College
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Toyo OKUI
Hokkaido Institute of Public Health
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Reiko KISHI
Department of Public Health, Sapporo Medical College
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Toshiko IKEDA
Department of Public Health, Sapporo Medical College
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Hirotsugu MIYAKE
Department of Public Health, Sapporo Medical College