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R Yoshida
Dept.of Public Health, School of Medicine, Chiba Univ.
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D Motomiya
Dept.of Public Health, School of Medicine, Chiba Univ.
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G Adachi
Dept.of Public Health, School of Medicine, Chiba Univ.
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S Kubo
Dept.of Pediatric, School of Medicine, Chiba Univ.
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S Funabashi
Dept.of Pediatric, School of Medicine, Chiba Univ.
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[in Japanese]
[in Japanese]