Saliva metabolomic profile of COVID-19 patients associates with disease severity.

"principal component analysis (pca) was implemented using pcago r shiny framework which is available at github com/hoelzer-lab/pcagom jheatmap was used to create the heatmaps which is available at http://jheatmap github io/jheatmap/ (deu-pons et al ).; metabolite set enrichment analysis (msea) were carried using metaboanalystr3 package which is available at github com/xia-lab/metaboanalystr (pang et al )."

"Declarations Conflict of interestThe authors declare no competing interests. Ethical approvalThis study was approved by Dubai Scientific Research Ethics Committee (DSREC). Written, informed consents were obtained from all study participants prior to inclusion. Conflict of interest The authors declare no competing interests."

"Funding The authors extend their appreciation to the Deanship of Scientific Research, king Saud University for funding through Vice Deanship of Scientific Research Chairs; Research Chair of Prince Abdullah Ben Khalid Celiac Disease research chair; Riyadh, Kingdom of Saudi Arabia."