“Evaluation of changes in vitamin B12, ferritin, folic acid, and thyroid hormone levels after sleeve gastrectomy ”, Ann Med Res , vol. 25, no. 1, pp. 0018–0021, May 2021, Accessed: Oct. 14, 2025. [Online]. Available: http://annalsmedres.org/index.php/aomr/article/view/1553