Figure 3: Geographic regions with difference in publication frequency.
From: A reference set of curated biomedical data and metadata from clinical case reports

Here, we visualize the distribution of locations of reports in the MACCR set across the world and within US states. Darker shades correspond to a greater significant difference between the count of CCRs in the MACCR set for a particular region (determined by institutional affiliation of the corresponding author) and the count of all CCRs for that region (as specified by MEDLINE index).