[1] VA Greater Los Angeles Healthcare Syst, Vet Affairs VA Qual Enhancement Res Initiat HIV &, Los Angeles, CA USA
[2] VA Greater Los Angeles Healthcare Syst, Ctr Study Healthcare Provider Behav, VA Greater Los Angeles Hlth Serv Res & Dev Ctr Ex, Los Angeles, CA USA
[3] Univ Calif Los Angeles, David Geffen Sch Med, Div Gen Internal Med, Los Angeles, CA 90095 USA
[4] VA Chicago Healthcare Syst, VA Ctr Management Complex Chron Condit, Chicago, IL USA
[5] VA Chicago Healthcare Syst, Qual Enhancement Res Initiat Spinal Cord Injury S, Chicago, IL USA
[6] VA New England Healthcare Syst, Bedford, MA USA
[7] VA Med Ctr, Washington, DC USA
[8] George Washington Univ, Infect Dis Sect, Washington, DC USA
[9] Michael E DeBakey VA Med Ctr, Infect Dis Sect, Houston, TX USA
[10] Baylor Coll Med, Dept Med, Houston, TX 77030 USA