RT Journal Article SR Electronic T1 Effectiveness of General Practitioner Advice to Smokers JF The Journal of the Royal College of General Practitioners JO J R Coll Gen Pract FD British Journal of General Practice SP 298 OP 299 VO 34 IS 262 A1 J. Ewards YR 1984 UL http://bjgp.org/content/34/262/298.4.abstract AB