title: Abustracts from japanese journal of hygiene (Nihon Eiseigaku Zasshi) Vol.54 No.4.
authors: Department of Social and Environmental Medicine, Osaka University Graduate School of Medicine, Osaka.
authors: K
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authors: Morimoto
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authors: Toda
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authors: Wei
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authors: Yonemitsu
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authors: Harada
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authors: Miyakita
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authors: Omori
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authors: Miyabayashl
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authors: Ueda
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authors: Satoh
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authors: Kagawa
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authors: Kaneko
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authors: Kobayashi
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authors: Demura
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authors: Goshi
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authors: Minami
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authors: Nagasawa
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authors: Sato
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authors: Kishida
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authors: Inaba
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authors: Iwata