Fig. 2
From: COVID-19-related medical research: a meta-research and critical appraisal
Dynamics of publication and trends in COVID-19 spread over time. This figure depicts the number of medical articles published and number of COVID-19 cases diagnosed worldwide over time (panel a) and the trends over time of peer-reviewed articles (N = 7468, panel b), categorized into publications without original data (N = 4190, 56.1%), original articles (N = 1109, 14.9%), cases reports (N = 697, 9.3%), reviews (N = 638, 8.6%), research letters (N = 786, 10.5%), and systematic reviews (N = 48, 0.6%)