Kim 2003.

Methods	Country: South Korea Recruitment: 152 male smokers who visited family practice at 1 tertiary hospital between November 2001 and January 2002
Participants	152 men (intervention = 76, control = 76) Average age: 45.9 years in intervention; 46.0 years in control
Interventions	1. Trained nurse provided telephone counselling to experimental group at 8th and 17th week of follow‐up 2. Control was self‐help material
Outcomes	Self‐reported smoking status at 25 weeks, no further detail provided
Notes	New for 2017 update. Study in Korean so had to be translated for inclusion in this review. Brief report, so some detail lacking
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Method not specified: "… using random sequence, they were randomized to experimental group (76) and control group (76)…”
Allocation concealment (selection bias)	Unclear risk	Not specified
Incomplete outcome data (attrition bias) All outcomes	Low risk	55/76 intervention and 57/76 control follow‐up at 25 weeks