Noor H. Mohammad, Ahmed Y. Hameed, and Aysar N. Mahmood. “Oro-Facial Manifestations of COVID-19 Infection in a Sample of Iraqi People”. Journal of Population Therapeutics and Clinical Pharmacology, vol. 30, no. 2, Feb. 2023, pp. 131-44, doi:10.47750/jptcp.2023.1079.