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Five most productive organizations 1990–1999.
| Standard Competition Ranking | Organizations | Articles (%) |
|---|---|---|
| First | National Institutes of Health (NIH), USA | 24 (6.3%) |
| Second | University of Texas System | 16 (4.2%) |
| Third | NIH National Cancer Institute (NCI) | 14 (3.7%) |
| Third | University of Manitoba, Canada | 14 (3.7%) |
| Fourth | University of Minnesota System | 12 (3.2%) |
