Tantawi, M., Sabbagh, H., Alkhateeb, N., Quritum, M., Abourdan, J., Qureshi, N., Qureshi, S., Hamoud, A., Mahmoud, N., Odeh, R., Al-Khanati, N., Jaber, R., Balkhoyor, A., Shabi, M., Folayan, M., Gomaa, N., Nahdi, R., Mahmoud, N., Wazziki, H., Alnaas, M., Samodien, B., Mahmoud, R., Assab, N., Saad, S., Alhachim, S., Alshaikh, A. & Abdelaziz, W. 2022, 'Oral manifestations in young adults infected with COVID-19 and impact of smoking: a multi-country cross-sectional study', PeerJ, 10, article no: e13555. https://doi.org/10.7717/peerj.13555