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Hiroyuki SUNAGAWA
Department of Food Hygiene, Hokkaido Institute of Public Health
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Koichi TAKESHI
Department of Food Hygiene, Hokkaido Institute of Public Health
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Kunio KAMEYAMA
Department of Food Hygiene, Hokkaido Institute of Public Health
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Sakae KIMURA
Hokkaido Abashiri Health Center
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Keishiro SHIRAISHI
Sapporo City Institute of Public Health
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Yoshiaki ANDO
Department of Food Hygiene, Hokkaido Institute of Public Health