Variants located upstream of CHRNB4 on chromosome 15q25.1 are associated with age at onset of daily smoking and habitual smoking.
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PLoS One. 2012;7(3):e33513. doi: 10.1371/journal.pone.0033513. Epub 2012 Mar 16.
PLoS One. 2012.
PMID: 22438940
Free PMC article.