Eefan, A. H. “Determining the Levels of Zinc, Iron, Vitamin D, Renin Hormone, and Cystatin in Patients With Kidney Failure”. Indonesian Journal on Health Science and Medicine, vol. 3, no. 1, Apr. 2026, p. 10.21070/ijhsm.v3i1.434, doi:10.21070/ijhsm.v3i1.434.