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. 2021 Apr 28;106(5-6):244–253. doi: 10.1159/000515908

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Copyright © 2021 by S. Karger AG, Basel

This article is made available via the PMC Open Access Subset for unrestricted re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for the duration of the COVID-19 pandemic or until permissions are revoked in writing. Upon expiration of these permissions, PMC is granted a perpetual license to make this article available via PMC and Europe PMC, consistent with existing copyright protections.

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Fig. 1 — Risklick AI clinical trial outcome for COVID-19 compared to other web-based resource registries. a, b The total raw number of clinical trials found by Risklick AI compared to other registries for drug classes (a) and specific treatments (b) used against COVID-19. c−e Analysis of search capacity of registered clinical trials by Risklick AI and clinicaltrials.gov based on the same dataset for hydroxychloroquine. Clinical trials were separated between common and unique outcomes (c). Unique outcomes were validated and separated between true-positive (true) and false-positive (false) results (d). The final total number of true-positive clinical trials comprises the addition of common findings and unique, true-positive findings (e). nd, no data.