[1] Univ Alabama Birmingham, Div Prevent Med, Birmingham, AL 35294 USA
[2] Univ Massachusetts, Sch Med, Div Hosp Med, Worcester, MA USA
[3] Univ Massachusetts, Sch Med, Dept Quantitat Hlth Sci, Worcester, MA USA
[4] Boston Univ, Sch Med, Clin Addict Res & Educ Unit, Gen Internal Med Sect, Boston, MA 02118 USA
[5] Boston Univ, Sch Publ Hlth, Dept Biostat, Crosstown Ctr, Boston, MA USA
[6] Boston Univ, Sch Publ Hlth, Data Coordinating Ctr, Crosstown Ctr, Boston, MA USA
[7] Boston Univ, Sch Publ Hlth, Dept Community Hlth Sci, Crosstown Ctr, Boston, MA USA
[8] Boston Univ, Sch Publ Hlth, Dept Epidemiol, Crosstown Ctr, Boston, MA USA
[9] Cleveland State Univ, Sch Hlth Sci, Cleveland, OH 44115 USA