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. 2020 Aug 13;11:1605. doi: 10.3389/fimmu.2020.01605

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Copyright © 2020 Leung, Chua, Mondragon, Zhong, Nguyen-Ngoc-Quynh, Imai, Vignesh, Suratannon, Mao, Lee, Kim, Chan, Liew, Huong, Kanegane, Muktiarti, Zhao, Santos-Ocampo, Latiff, Seger, Ochs, Singh, Lee and Lau.

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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Mean testing level by country/region. Testing levels are assigned according to Table 1 for each abstract. Mean testing level positively correlated with HDI by two-tailed Pearson correlation (r = 0.742, p = 0.002). Error bars show the range of ±1 S.D. of mean testing level of cases from the country/region. n is the number of abstracts from that country/region included in this analysis. Countries/regions are in ascending order according to their HDI from the left. HDI, Human Development Index.