Qu, J., Yang, J., Chen, M., Cui, L., Wang, T., Gao, W., Tian, J., & Wei, R. (2019). MicroRNA-21 as a diagnostic marker for hepatocellular carcinoma: A systematic review and meta-analysis: MiR-21 in HCC. Pakistan Journal of Medical Sciences, 35(5). https://doi.org/10.12669/pjms.35.5.685