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. Author manuscript; available in PMC: 2016 Jul 31.
Published in final edited form as: Cochrane Database Syst Rev. 2015 Jul 31;7:CD005549. doi: 10.1002/14651858.CD005549.pub3

Comparison 1. Intervention versus control

Outcome or subgroup title No. of studies No. of participants Statistical method Effect size
1 Prolonged Cessation 3 Risk Ratio (M-H, Fixed, 95% CI) Subtotals only