链接：
http://www.ncbi.nlm.nih.gov/pubmed/20889482
Nicotine Tob Res. 2010 Oct;12 Suppl:S58-63.
Socioeconomic position and abrupt versus gradual method of quitting smoking: findings from the International Tobacco Control Four-Country Survey.Siahpush M, Yong HH, Borland R, Reid JL.
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