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Flowchart describing progress of patients through the Patch II Study. Participants enrolled in a randomized, placebo-controlled trial of nicotine replacement patch (Patch Trial) were recontacted 8 years after the trial for genotyping (Patch II Study). Numbers of subjects at each point of contact are indicated in the figure. *One participant in each treatment group was not successfully genotyped. **Smoking outcome data was missing for one participant of Caucasian ancestry.
