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. 2021 May 25;92(5):1255–1261. doi: 10.1038/s41390-021-01577-5

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© The Author(s), under exclusive licence to the International Pediatric Research Foundation, Inc 2021

This article is made available via the PMC Open Access Subset for unrestricted research re-use and secondary analysis in any form or by any means with acknowledgement of the original source. These permissions are granted for the duration of the World Health Organization (WHO) declaration of COVID-19 as a global pandemic.

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Fig. 1 — Map of ECHO Pediatric Cohort Recruitment Sites and the Institutional Development Award (IDeA) States Pediatric Clinical Trials Network (ISPCTN).