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Al-Maweri, Sadeq Ali and Alhajj, Mohammed Nasser and Halboub, Esam and Tamimi, Faleh and Salleh, Nosizana Mohd and Al-Ak'hali, Mohammed Sultan and Kassim, Saba and Abdulrab, Saleem and Anweigi, Lamyia and Mohammed, Marwan Mansoor Ali (2023) The impact of periodontal disease on the clinical outcomes of COVID-19: A systematic review and meta-analysis. BMC Oral Health, 23 (1). ISSN 1472-6831, DOI https://doi.org/10.1186/s12903-023-03378-0.