Regions	N	Percentage
European Region	25,145	52.1
North America	19,271	39.9
Western Pacific Region	1,671	3.5
South-East Asia Region	882	1.8
South America	683	1.4
Eastern Mediterranean Region	432	0.9
African Region	187	0.4
Total	48,271	100.0

N = total number of original research publications.

Data source: https://www.who.int/emergencies/diseases/novel-coronavirus-2019/global-research-on-novel-coronavirus-2019-ncov.

* Search strategy run on 04 February 2021 with no restriction to language, publication year or journal/database. We only included original research studies related to risk factors, prognostic, diagnostic, aetiology, and observational studies, case report, screening study, prevalence, incidence, randomized trials, implementation research, qualitative research or health economic evaluations.