Chunk #3 — METHODS AND MATERIALS — Subjects and Diagnostic Procedures

Source

Genome-wide association study of nicotine dependence in American populations: identification of novel risk loci in both African-Americans and European-Americans.

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any substance. A subgroup of FSCD subjects was not alcohol dependent but had a lifetime DSM-IV diagnosis of dependence on cannabis or another illicit drug. COGEND subjects were recruited in Missouri and Michigan. COGEND cases met criteria for DSM-IV alcohol and/or nicotine dependence. Control subjects were selected from the nondependent population and did not meet criteria for alcohol, nicotine, or illicit drug dependence.