Fig. 9

A world map representing the number of illegal kidney trade cases in which countries were reported as an illegal transplant surgery provider. The upper panel shows the map for the first decade (2000–2011) while the lower panel shows the map for the second decade (2012–2022). In each panel, the countries with at least one case serving as an illegal transplant surgery provider were classified into 5 groups using quantiles. Countries with a darker green shade correspond to more cases in which they appeared as an illegal transplant surgery provider