Hoving 2010.

Methods	Setting: community, Netherlands Recruitment: 75 general practices (passive recruitment via questionnaire in waiting room), 65 pharmacies (15 passive, 50 active recruitment)
Participants	1019 smokers (545 pharmacy, 474 GP); motivated to quit within 6 months; smoked in last 7 days before baseline assessment 56% female, average age 45, average cpd 22
Interventions	All participants completed baseline questionnaire ∙ Mailed 5‐ to 7‐page tailored letter, using same tailoring as Dijkstra 1998a (based on I‐change model) ∙ Thank you letter only
Outcomes	Continuous abstinence from baseline at 3 months and at 12 months in pharmacy group, at 6 months in GP group Validation: none
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	High risk	"Randomised based on the colour coding on their questionnaire (blue for experimental group, yellow for control group)"
Allocation concealment (selection bias)	High risk	Allocation would not be concealed if anyone was aware of the significance of colour
Blinding (performance bias and detection bias) All outcomes	Unclear risk	Not specified
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	Only experimental losses to follow‐up reported (63/256 pharmacy, 42/220 GP); unclear how many participants in the control group were lost