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

Jensen 1984.

Methods Randomized controlled trial
Participants Patients with chronic anal fissure
Interventions Anal stretch (28) versus lateral subcutaneous sphincterotomy (30)
Outcomes Persistence of the fissure and incontinence to flatus
Notes  
Risk of bias
Bias Authors' judgement Support for judgement
Random sequence generation (selection bias) High risk randomisation by hospital registration number ‐ inadequate
Blinding of outcome assessment (detection bias) 
 All outcomes High risk inadequate
Drop‐outs 
 All outcomes Low risk zero