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. 2009 Jan 21;2009(1):CD000532. doi: 10.1002/14651858.CD000532.pub2

Simpson 2003.

Methods Design: CBA 
 Base measurement: Done 
 Base control (2nd site): Done 
 Blind assessment: Done 
 Contamination protection (2nd site): Done 
 Reliable: Done 
 Follow up: 
 Professionals: Done 
 Patients: NA
Participants 85 practices 
 UK
Interventions Counsellors 
 Counselling
Outcomes Indirect effects
Notes  
Risk of bias
Bias Authors' judgement Support for judgement
Allocation concealment? Unclear risk D ‐ Not used