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   Dong Ryul Kim et al, 2017, The Korean Journal of Helicobacter and Upper Gastrointestinal Research CrossRef
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   Ko Harada et al, 2018, Internal Medicine CrossRef
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   Anwei Xue et al, 2019, Journal of Cancer Research and Clinical Oncology CrossRef
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   Koji Takahashi et al, 2020, Clinical Journal of Gastroenterology CrossRef