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. 2020 Dec 29;15(12):e0243464. doi: 10.1371/journal.pone.0243464

Fig 2. Study characteristics by location.

Fig 2

SOURCE: Adapted from the public domain Natural Earth (https://www.naturalearthdata.com/downloads/10m-raster-data/10m-gray-earth/). NOTE: HIC = high income country, UMIC = upper middle income country, LMIC = lower middle income country, LIC = low income country.