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. 2021 May 5;6(5):e004823. doi: 10.1136/bmjgh-2020-004823

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© Author(s) (or their employer(s)) 2021. Re-use permitted under CC BY. Published by BMJ.

This is an open access article distributed in accordance with the Creative Commons Attribution 4.0 Unported (CC BY 4.0) license, which permits others to copy, redistribute, remix, transform and build upon this work for any purpose, provided the original work is properly cited, a link to the licence is given, and indication of whether changes were made. See: https://creativecommons.org/licenses/by/4.0/.

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Total/government spending per birth on routine immunisation vaccines of country groups. Data source: WU2. Indicators are in constant 2010 US$. The trends of LIC+, LIC− and LMIC were fitted by linear mixed-effects models; note part of LMIC trend was cut off for visibility. CIs of 95% surround LIC+ and LIC− trends and were computed through a parametric bootstrap method for mixed-effects models (10 000 simulations). LIC+ countries (ISO3): Burundi (BDI), Burkina Faso (BFA), Gambia (GMB), Nepal (NPL), Rwanda (RWA), Tajikistan (TJK), Tanzania (TZA) and Uganda (UGA). LIC, low-income countries; LMIC, lower-middle income countries.