TF and Iron deficiency anemia: Among the patients with CKD, 40 (33%) exhibited iron deficiency, as characterized by transferrin saturation ≤ 20% and ferritin ≤ 10 μg/dl3 (Supplementary Figure 2A), whereas 24 patients manifested iron deficiency anemia (21%, out of n = 114) (Supplementary Figure 2B).