[1] Univ Texas Med Branch, Dept Prevent Med & Community Hlth, Galveston, TX 77555 USA
[2] Univ Texas Med Branch, Correct Managed Care Div, Galveston, TX 77555 USA
[3] Univ Texas Med Branch, Dept Obstet & Gynecol, Galveston, TX 77555 USA
[4] Univ Texas Med Branch, Dept Internal Med, Galveston, TX 77555 USA
[5] Baylor Coll Med, Dept Med, Houston, TX 77030 USA
[6] Michael E DeBakey VA Med Ctr, Houston Ctr Qual Care & Utilizat Studies, Houston, TX USA
[7] Brown Med Sch, Dept Med, Providence, RI USA
[8] Dept State Hlth Serv, Texas HIV Medicat Program, Austin, TX USA
[9] Univ Texas Hlth Sci Ctr San Antonio, Dept Epidemiol & Biostat, San Antonio, TX 78229 USA