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Hiroshi MUTO
University of Tsukuba, the department of gastroenterology
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Yoko SAITO
University of Tsukuba, the department of gastroenterology
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Yoichi FURUKAWA
Ibaraki prefectural mass servey society
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Hisayuki FUKUTOMI
University of Tsukuba, the department of gastroenterology
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Naohiko TOKITA
Ibaraki prefectural mass servey society