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Characteristics of included studies.
| Study | UC patients (n) | Healthy controls (n) | Population | NOS# |
|---|---|---|---|---|
| Own research | 10 | 10 | Polish | 7 |
| Bajer 201735 | 32 | 31 | Czech | 7 |
| Alam 202036 | 11 | 10 | English | 7 |
| Clooney 202037 | 228 | 161 | Canadian and Irish | 7 |
#Newcastle Ottawa scale (NOS) used to assess the quality of bias control.
