[1] Univ London Imperial Coll Sci Technol & Med, Fac Med, Dept Med,Immunol Sect, Chelsea & Westminster Hosp,Div Infect Dis, London, England
[2] Johns Hopkins Univ, Sch Med, Dept Mol & Comparat Pathobiol, Retrovirus Lab, Baltimore, MD USA
[3] Univ Milan, Cattedra Immunol, Milan, Italy
[4] Innsbruck Med Univ, Bioctr, Div Biol Chem, Innsbruck, Austria
[5] Osped SM Annunziata, Div Malattie Infett, Florence, Italy
[6] NCI, Expt Immunol Branch, Ctr Canc Res, NIH, Bethesda, MD 20892 USA
[7] Fdn Don Gnocchi IRCCS, Milan, Italy
[8] Johns Hopkins Sch Med, Dept Med, Johns Hopkins Bayview Prote Ctr, Baltimore, MD USA