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| Case Study 1 | Case Study 2 | Case Study 3 | |
| Before any filtration | 66 stories (0.02%) | 0 stories (0%) | 1 story (0.0008%) |
| After all the filtrations | 0 stories (0%) | 0 stories (0%) | 0 stories (0%) |
Only a small number of unfiltered stories could be found by exploring related citations provided by PubMed. None of the final set of stories could be discovered by traversal of PubMed's related citations.
