Mohanad A. Salih, Murtadha M. Hamad, and Wesam M. Jasim. “Analysis of COVID-19 Database for Defining the Most Important Symptoms”. Journal Healthcare Treatment Development 3, no. 01 (May 30, 2023): 103–119. Accessed June 30, 2026. https://hmjournals.com/journal/index.php/JHTD/article/view/2000.