Amalia Puspita Dewi, Mardianto, and M. S. Nasution, “Relationship Between Micronutrient Ferritin, Vitamin D, And Calcium With The Severity Of Diabetic Foot Based On The Wagner-Meggitt Criteria At Adam Malik Hospital”, JETROMI, vol. 7, no. 2, pp. 55–64, May 2025.