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. 2011 Nov 9;2011(11):CD002199. doi: 10.1002/14651858.CD002199.pub4

Boulos 1984.

Methods Randomized controlled trial
Participants Patients with chronic anal fissure
Interventions Open (14) versus subcutaneous (14) partial lateral internal sphincterotomy
Outcomes Persistence of the fissure and incontinence to flatus
Notes  
Risk of bias
Bias Authors' judgement Support for judgement
Random sequence generation (selection bias) Low risk pulling classification cards once surgery had been determined to be necessary
Blinding of outcome assessment (detection bias) 
 All outcomes High risk inadequate
Drop‐outs 
 All outcomes Low risk zero