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Most relevant countries by corresponding author.
| Country | Articles, N | Frequency | SCPa | MCPb | MCP/article ratio |
| USA | 45 | 0.776 | 42 | 3 | 0.07 |
| Germany | 2 | 0.035 | 2 | 0 | 0 |
| Italy | 2 | 0.035 | 2 | 0 | 0 |
| Netherlands | 2 | 0.035 | 2 | 0 | 0 |
| United Kingdom | 2 | 0.035 | 2 | 0 | 0 |
| Australia | 1 | 0.017 | 1 | 0 | 0 |
| Canada | 1 | 0.017 | 1 | 0 | 0 |
| France | 1 | 0.017 | 1 | 0 | 0 |
| Mexico | 1 | 0.017 | 1 | 0 | 0 |
| Sweden | 1 | 0.017 | 1 | 0 | 0 |
aSCP: single-country publication.
bMCP: multiple-country publication.
