Disribution of included studies by geography and income classification. (A) World map of included studies. Income classification is shown by shade of red, with darker colors indicating higher income countries and the number of included studies is shown in the text attached to each country name. (B) Studies published from 1976 to 2024 by 2021 GDP per capita of the country in which the study took place, regardless of the year of the study. Reference, lowest GDP per capita country was Malawi at $633. USD, United States dollars.
Figure 2.

Disribution of included studies by geography and income classification. (A) World map of included studies. Income classification is shown by shade of red, with darker colors indicating higher income countries and the number of included studies is shown in the text attached to each country name. (B) Studies published from 1976 to 2024 by 2021 GDP per capita of the country in which the study took place, regardless of the year of the study. Reference, lowest GDP per capita country was Malawi at $633. USD, United States dollars.

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