D. K. . Prawira Lesmana, D. . Rifsal Siregar, and D. . Hermansyah, “Clinicopathological Characteristics of Invasive Breast Carcinoma on PDL-1 Immunohistochemical Expression in H. Adam Malik Hospital Medan”, Sumat. Med. J., vol. 6, no. 1, pp. 20–27, Mar. 2023.