Wang 2005.

Methods	RCT
Participants	Patients with chronic anal fissure who had failed conservative management
Interventions	PML Sphincterotomy (50) vs. Fissurectomy and ?Pectinotomy? (50).
Outcomes	Healing time and "success" rate
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	High risk	randomisation method not specified
Blinding of outcome assessment (detection bias) All outcomes	High risk	inadequate
Drop‐outs All outcomes	Low risk	10/100 = 10% (borderline)