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| Changed component | n | % |
| Change in any component | 138/279 | 49,7 |
| Title | 34/279 | 12,3 |
| Number of authors | 101/279 | 36,4 |
| Order of authorship | 19/279 | 6,8 |
| Number of study subjects | 27/279 | 9,9 |
| Quantitative results | 5/279 | 1,7 |
| Conclusions | 12/279 | 4 |
