Effect of Psychological Stress on Salivary Cortisol and Trace Elements of Copper, Iron and Manganese in Patients with Periodontitis. KJAR [Internet]. 2025 Jun. 22 [cited 2025 Aug. 9];10(1):146-57. Available from: https://cpanel.spu.edu.iq/index.php/kjar/article/view/999