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Koji Furuya
Hokkaido Institute of Public Health, Japan
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Masanori Kawanaka
Department of Parasitology, National Institute of Infectious Diseases, Japan
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Naoki Sato
School of Medicine, Hokkaido University, Japan
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Hiroshi Honma
Hokkaido Institute of Public Health, Japan
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Masahide Tamura
Hokkaido Institute of Public Health, Japan