1. World Health Organization. COVID-19 Dashboard. (2023). Accessed: March 21, 2023: https://covid19.who.int/.
2. Three waves changes, new variant strains, and vaccination effect against COVID-19 pandemic;El-Shabasy RM;Int J Biol Macromol,2022
3. United States Census Bureau. New census data show differences between urban and rural populations. (2016). Accessed: March 21, 2023: https://www.census.gov/newsroom/press-releases/2016/cb16-210.html#:~:text=Adults%20in%20rural%20areas%20had,19.5%20pe....
4. Rural Health Research Gateway. Rural Communities. Age, Income, and Health Status. (2018). Accessed: March 21, 2023: https://www.ruralhealthresearch.org/alerts/262.
5. Rural-Urban Differences Among Older Adults;Tuttle C,2020