[1] GlaxoWellcome HIV Clin Res, London, England
[2] UCL Royal Free Hosp, London NW3 2QG, England
[3] Univ Geneva, Geneva, Switzerland
[4] Univ New S Wales, Natl Ctr HIV Epidemiol & Clin Res, Sydney, NSW, Australia
[5] UCL Royal Free & Univ Coll, Sch Med, London, England
[6] Univ Besancon, Med Ctr, F-25030 Besancon, France
[7] Hop La Pitie Salpetriere, Lab Immunol Cellulaire & Tissulaire, Paris, France
[8] Karolinska Inst, Stockholm, Sweden
[9] Montreal Gen Hosp, Montreal, PQ H3G 1A4, Canada