1. Missing data;Allison,2001
2. Diagnostic and statistical manual of mental disorders, text revision (DSM-IV-TR);American Psychiatric Association,2000
3. Meta-analysis of the cognitive effects of the catechol-O-methyltransferase gene Val158/108Met polymorphism;Barnett;Biological Psychiatry,2008
4. Nicotine chemistry, metabolism, kinetics and biomarkers;Benowitz;Handbook of Experimental Pharmacology,2009
5. Current cigarette smoking among adults – United States, 2011;Centers for Disease Control and Prevention;Morbidity and Mortality Weekly Report,2012