[1] Vet Affairs Med Ctr, Washington, DC 20422 USA
[2] George Washington Univ, Washington, DC USA
[3] Univ Minnesota, Sch Publ Hlth, Div Biostat, Minneapolis, MN 55455 USA
[4] Univ Paris 06, Hop St Antoine, Serv Malad Infect & Trop, Paris, France
[5] Inst Med & Epidemiol Appl, Paris, France
[6] Univ Copenhagen, Copenhagen HIV Programme, Copenhagen, Denmark
[7] Univ Barcelona, Hosp Clin, Inst Invest Biomed August Pi Sunyer, Barcelona, Spain
[8] Univ Hosp, Leicester, Leics, England
[9] MRC, London, England
[10] Michael E DeBakey Vet Affairs Med Ctr, Houston, TX USA
[11] Baylor Coll Med, Houston, TX 77030 USA
[12] Univ Chile, Sch Med, Santiago, Chile
[13] Arriaran Fdn, Santiago, Chile
[14] Kings Coll London, Dept HIV & Genitourinary Med, London WC2R 2LS, England
[15] Univ New S Wales, Sydney, NSW, Australia
[16] Univ Oklahoma, Coll Med, Oklahoma City, OK 73190 USA
[17] Vet Affairs Med Ctr, Oklahoma City, OK 73104 USA