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Takeshi Sawada
Division of Gastroenterology, Department of Internal Medicine, Sapporo Shirakaba-dai Hospital, Japan
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Mio Yoshida
Division of Gastroenterology, Hokkaido Cardiovascular Hospital, Japan
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Yasushi Adachi
Division of Gastroenterology, Department of Internal Medicine, Sapporo Shirakaba-dai Hospital, Japan
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Takao Endo
Division of Gastroenterology, Department of Internal Medicine, Sapporo Shirakaba-dai Hospital, Japan