Kaymaz, Esin, et al. “The Relationship of Clinicopathological Findings and PDGFR-β Expression With Tumor Recurrence in Gastrointestinal Stromal Tumors”. Turkish Journal of Gastroenterology, vol. 32, no. 12, Jan. 2021, pp. 1038-4, doi:10.5152/tjg.2021.21148.