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Classification systems for persistent perineal sinus
| Study | Study type | Type of classification |
|---|---|---|
| Watts 1966 [38] | Retrospective case series | Temporal |
| Yamamoto 1999 [33] | Retrospective case series | Temporal |
| Anthony 1990 [14] | Case series | Temporal |
| Wilson et al. [35] | Systematic review | Anatomical |
| TOpClass classification [34] | Expert consensus | Hybrid disease characteristic/management/clinician and patient goals |
