Finally, although the quantification of parathyroid hormones (to diagnostic secondary hyperparathyroidism), ferritin, and the percentage of transferrin saturation levels is mandated by current clinical guidelines in public healthcare settings in Mexico [18], data regarding the levels of parathyroid hormones and ferritin percentage of saturation were only available for approximately 20% of the enrolled patients because of administrative reasons. Here, TF is linked to secondary hyperparathyroidism.