Adham, Zeina S, and Batool H Al-Ghurabi. “Prevalence of Viral Co-Infection Among COVID-19 Cases in Association Disease Severity and Oral Hygiene”. Journal of Baghdad College of Dentistry 33, no. 3 (September 15, 2021): 1–8. Accessed November 2, 2024. https://jbcd.uobaghdad.edu.iq/index.php/jbcd/article/view/2947.