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PICO criteria for study inclusion
| PICO element | Keywords |
|---|---|
| P—Population | Patients with perianal fistulizing Crohn’s disease |
| I—Intervention | Advancement flap procedure (specified number of patients or procedures) |
| C—Comparison | No comparison group needed (observational studies accepted) |
| O—Outcomes | Clinical outcomes, such as success rate or recurrence rate |
