Assessment of copper, zinc and lead levels in patients with renal failure before and after their first dialysis . cbej [Internet]. 2025 Oct. 27 [cited 2026 Jun. 4];1(وقائع المؤتمر العلمي لكلية التربية الأسا):107-12. Available from: https://cbej.uomustansiriyah.edu.iq/index.php/cbej/article/view/13868