**5. Conclusions**

This study showed that COVID-19 related publications were primarily contributed by major research hubs such as the United States, China, and European countries. Global researchers have been currently focused on clinical management, viral pathogenesis, and public health responses in combating against COVID-19. Meanwhile, little attention has been paid to psycho-social problems or of the impacts of COVID-19 on different vulnerable populations. Findings of this study suggest the need for global research collaboration among high- and low/middle-income countries in the different stages of the pandemic prevention and control. This paper can serve as a reference for governments and research institutions to identify the research priority in their settings and allocate appropriate resources for research on COVID-19.

**Author Contributions:** Conceptualization, B.X.T., G.T.V., C.A.L., and R.C.M.H.; data curation, G.H.H., M.T.H., H.T.L., and C.S.H.H.; formal analysis, B.X.T., L.H.N., G.T.V., M.T.H., and C.A.L.; funding acquisition, C.S.H.H. and R.C.M.H.; investigation, B.X.T., L.H.N., and C.S.H.H.; methodology, G.H.H., L.H.N., G.T.V., M.T.H., H.T.L., C.A.L., and R.C.M.H.; resources, B.X.T., G.H.H., L.H.N., G.T.V., and C.S.H.H.; software, G.H.H., H.T.L., C.A.L., and R.C.M.H.; supervision, B.X.T., G.T.V., H.T.L., C.S.H.H., and R.C.M.H.; validation, B.X.T., M.T.H., and C.A.L.; visualization, L.H.N., and G.T.V.; writing—original draft, B.X.T., G.H.H., L.H.N., G.T.V., M.T.H., H.T.L., C.A.L., C.S.H.H., and R.C.M.H.; and writing—review and editing, B.X.T., G.H.H., L.H.N., G.T.V., M.T.H., H.T.L., C.A.L., C.S.H.H., and R.C.M.H. All authors have read and agreed to the published version of the manuscript.

**Funding:** This research is supported by Vingroup Innovation Foundation (VINIF) in project code VINIF.2020.COVID-19.DA03.

**Acknowledgments:** This research is supported by Vingroup Innovation Foundation (VINIF) in project code VINIF.2020.COVID-19.DA03.

**Conflicts of Interest:** The authors declare no conflict of interest.
