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| Risk factors | Numbers (%) |
|---|---|
| Diabetes mellitus | 13 (33.3) |
| Liver cirrhosis | 6 (15.4) |
| Malignancy | 5 (12.8) |
| Recent invasive surgery | 5 (12.8) |
| Indwelling catheter | 4 (10.3) |
| Renal failure | 3 (7.7) |
| No risk factor found | 6 (15.4) |
