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Xu L, Zhang M, Zheng X, Yi P, Lan C, Xu M (2017). "The circular RNA ciRS-7 (Cdr1as) acts as a risk factor of hepatic microvascular invasion in hepatocellular carcinoma". J. Cancer Res. Clin. Oncol. 143 (1): 17–27. doi:10.1007/s00432-016-2256-7. PMID27614453. S2CID7373463.