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. 2021 Oct 20;9:763060. doi: 10.3389/fped.2021.763060

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Copyright © 2021 Aldersley, Lawrenson, Human, Shaboodien, Cupido, Comitis, De Decker, Fourie, Swanson, Joachim, Magadla, Ngoepe, Swanson, Revell, Ramesar, Brooks, Saacks, De Koning, Sliwa, Anthony, Osman, Keavney and Zühlke.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Number of publications per country included in the global prevalence studies by Liu et al. (8) and van der Linde et al. (4).