Saliva metabolomic profile of COVID-19 patients associates with disease severity. - Saheb Sharif-Askari N; Soares NC; Mohamed HA; Saheb Sharif-Askari F; Alsayed HAH; Al-Hroub H; Salameh L; Osman RS; Mahboub B; Hamid Q; Semreen MH; Halwani R (Metabolomics : Official journal of the Metabolomic Society, 2022)