“Severe Hyponatremia with Normokalemia in Pembrolizumab-Lenvatinib Combination Therapy for Metastatic Renal Cell Carcinoma: A Case of Suspected Secondary Adrenal Insufficiency and Clinical Differentials”, OAIJMR, vol. 6, no. 1, pp. 35–50, Nov. 2025, doi: 10.37275/oaijmr.v6i1.826.