Kottke TE, Brekke ML, Solberg LI, Hughes JR (1989)
A randomized trial to increase smoking intervention by physicians. Doctors helping smokers, round 1. JAMA 261:2101-2106.
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Acknowledgements

The editors are grateful to:

JAMA for making a toll free link to the pdf of this article available (email to Iain Chalmers from Annette Flanagin, 29 August 2014).