- Large, global database, including all ages
- Possible reporting bias (based on the willingness of physicians): reporting of the most severe cases
- Selection bias also possible in the other way: the most serious cases who died outside the hospital are not recorded.
- Possibility of unmeasured confounding factors
Corticosteroids, but not TNF Antagonists, are Associated with Adverse COVID-19 Outcomes in Patients With Inflammatory Bowel Diseases: Results from an International Registry
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