1. Center for Immunology and Inflammatory Diseases, Division of Rheumatology, Allergy and Immunology, Massachusetts General Hospital, Harvard Medical School, Charlestown, Massachusetts 02129
2. Partners AIDS Research Center, Massachusetts General Hospital and Division of AIDS, Harvard Medical School, Charlestown, Massachusetts 02129
3. Department of Pathology, Massachusetts General Hospital, Boston, Massachusetts 02114
4. Medizinische Poliklinik, Ludwig-Maximilians-Universitaet, Muenchen, Germany