[1] NIAAA, Div Epidemiol & Prevent Res, Bethesda, MD 20892 USA
[2] Boston Univ, Sch Publ Hlth, Dept Biostat, Boston, MA USA
[3] Boston Univ, Sch Publ Hlth, Data Coordinating Ctr, Boston, MA USA
[4] Harvard Univ, Sch Publ Hlth, Dept Soc Human Dev & Hlth, Boston, MA 02115 USA