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   Yuyi Li et al, 2021, Frontiers in Oncology CrossRef
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   Jian-Nan Li et al, 2020, World Journal of Gastrointestinal Oncology CrossRef
3. The Roles of Mesenchymal Stem Cells in Gastrointestinal Cancers
   Ze Xiang et al, 2022, Frontiers in Immunology CrossRef