[1] Univ Massachusetts, Med Ctr, Worcester, MA 01605 USA
[2] Univ Alabama Birmingham, Sch Med, Birmingham, AL 35233 USA
[3] Texas Dept Hlth, Bur HIV & STD, Austin, TX 78756 USA
[4] Univ Alabama, Tuscaloosa, AL 35401 USA
[5] Oregon Hlth & Sci Univ, Dept Emergency Med, Portland, OR 97201 USA
[6] Univ Texas, Hlth Sci Ctr, Sch Publ Hlth, Houston, TX 77225 USA
[7] Univ Texas, Ctr Hlth Promot, Austin, TX 78712 USA
[8] Univ Rhode Isl, Canc Prevent Res Ctr, Kingston, RI 02881 USA
[9] NHLBI, Off Prevent Educ & Control, Bethesda, MD 20892 USA
[10] Univ Minnesota, Div Epidemiol, Minneapolis, MN 55455 USA