S. T. Nainggolan, P. R. Situmorang, R. V. B. Tarigan, and D. S. Napitupulu, “Analysis of Electrolyte Levels in Chronic Kidney Failure Patients Undergoing Hemodialysis at Elisabeth Hospital, Medan”, j. ilm. kesehat., vol. 18, no. 2, pp. 532–542, Sep. 2026.