Feizal Faturahman, Mulawan Umar and Theodorus (2026) “Serum Calcium as a Preoperative Surrogate of Tumour Burden in Stage III Breast Carcinoma: A Cross-Sectional Surgical-Oncology Study”, Sriwijaya Journal of Surgery, 9(1), pp. 156-167. doi: 10.37275/sjs.v9i1.153.