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Countries and regions that contributed the most to the research field of universal health coverage (UHC) during 1990-2019.
| Country | Number of UHC-related research papers contributed |
| United States | 2426 |
| United Kingdom | 919 |
| Canada | 545 |
| Switzerland | 469 |
| India | 395 |
| Australia | 370 |
| South Africa | 299 |
| Thailand | 285 |
| Brazil | 219 |
| China | 215 |
| France | 205 |
| Japan | 181 |
| Italy | 176 |
| Netherlands | 173 |
| Germany | 161 |
| Spain | 158 |
| Belgium | 149 |
| Mexico | 131 |
| Taiwan | 129 |
| Kenya | 120 |
