求英文文献一篇
http://www.ncbi.nlm.nih.gov/pubmed/21666098
Proactive telephone counseling for smoking cessation: meta-analyses by recruitment channel and methodological quality.
Tzelepis F. Paul CL. Walsh RA. McElduff P. Knight J.
Journal of the National Cancer Institute. 103(12):922-41, 2011 Jun 22.