Restrepo Valencia, César Augusto, and Jose Vicente Aguirre Arango. “Vitamin D (25 ( OH) D ) in Patients With Chronic Kidney Disease Stages 2-5”. Colombia Medica 47, no. 3 (September 30, 2016): 160–66. Accessed November 25, 2025. http://colombiamedica.univalle.edu.co/index.php/comedica/article/view/2148.