Restrepo Valencia, César, and Jose Aguirre Arango. “Vitamin D (25 ( OH) D ) in Patients With Chronic Kidney Disease Stages 2-5”. Colombia Médica 47, no. 3 (September 29, 2016): 160-66. Accessed April 24, 2025. https://colombiamedica.univalle.edu.co/colombiamedica311/index.php/comedica/article/view/2148.