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Cochrane Tobacco Addiction Review Group register of trials, which included the results of searches of Medline, PsycINFO, and conference abstracts (all to Aug 2005).
Study selection and assessment:
randomised or quasi-randomised controlled trials of participants who had quit smoking on their own, were in enforced abstinence, or were in cessation programmes; had ⩾6 months of follow up; and compared relapse prevention …
For correspondence: Dr T Lancaster, University of Oxford, Oxford, UK.
Source of funding: UK National Health Service.