He, L. and Zhou, Y. 2022. Evaluation of increased microRNA-21 in the serum of patients with cardia cancer: MiR-21 in serum of cardia cancer patients. Cellular and Molecular Biology. 68, 4 (Apr. 2022), 60–65. DOI:https://doi.org/10.14715/cmb/2022.68.4.8.