Das S, John M, Adiody S. Relevance of copper/zinc ratio and its association with redox status in chronic obstructive pulmonary disease. Int J Community Med Public Health [Internet]. 2024 May 30 [cited 2025 Nov. 16];11(6):2291-5. Available from: https://www.ijcmph.com/index.php/ijcmph/article/view/12480