Mahmud M. Prevalence of mortality among covid-19 patients in Kurdistan Region and various parts of the world and the role of ecological and environmental factors in shaping SARS-CoV-2 virulence. Polytechnic j. [Internet]. 2023Apr.16 [cited 2024May6];12(1):141-8. Available from: https://journals.epu.edu.iq/index.php/polytechnic/article/view/836