Study procedures were approved by the University of Missouri and Washington University Institutional Review Boards, and written informed consent was obtained prior to each session. Participants were recruited from the University of Missouri, the city of Columbia, Missouri, and the surrounding area. Fliers were placed at various locations on campus and at local businesses. Potential participants were screened by phone to determine eligibility for the study. Participants who met eligibility criteria were scheduled for an in-person interview conducted by a trained research assistant in a private office. Participants also completed questionnaire measures, including self-report measures of alcohol use. Buccal brush samples were taken from each participant for genotyping. Participants received $40 for their participation in the interview.
