Importance of internal and external validity in clinical research: comment on the article by Fatima et al
- PMID: 34224659
- DOI: 10.1002/art.41919
Importance of internal and external validity in clinical research: comment on the article by Fatima et al
Comment on
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Measurement of patient outcome in arthritis.Arthritis Rheum. 1980 Feb;23(2):137-45. doi: 10.1002/art.1780230202. Arthritis Rheum. 1980. PMID: 7362664
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