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Odds ratios (ORs) and 95% confidence intervals (CIs) of individual studies and pooled data for all included association studies between heroin dependence and (A) the allelic distribution in serotonin transporter gene promoter polymorphism (5-httlpr), and (B) the allelic distribution in 17-bp variant number tandem repeats in intron 2 of 5-HTT gene (STin2).
Abbreviations: 5-httlpr, 5-hydroxytryptamine transporter-linked promotor region; STin2, serotonin transporter intron 2.
