[1] Brown Univ, Ctr Alcohol & Addict Studies, Sch Publ Hlth, Providence, RI 02912 USA
[2] Univ Michigan, Dept Hlth Behav & Hlth Educ, Sch Publ Hlth, Ann Arbor, MI USA
[3] Univ Maryland, Dept Psychol, Lavender Lab, College Pk, MD USA
[4] Brown Univ, Ctr Alcohol & Addict Studies, Brown Sch Publ Hlth, Dept Behav & Social Sci, Box G-S121-5, Providence, RI 02912 USA