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Masumi Taguchi
Osaka Prefectural Institute of Public Health, Japan
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Kazuko Seto
Osaka Prefectural Institute of Public Health, Japan
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Masashi Kanki
Osaka Prefectural Institute of Public Health, Japan
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Teizo Tsukamoto
Osaka Prefectural Institute of Public Health, Japan
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Hidemasa Izumiya
National Institute of Infectious Diseases, Japan
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Haruo Watanabe
National Institute of Infectious Diseases, Japan