1. Department of MedicineDivision of RheumatologyThe University of Iowa College of MedicineIowa CityIowa52242USA
2. Cellular Immunology SectionNational Institute of Arthritis and Musculoskeletal and Skin Diseases, NIHBethesdaMaryland20892USA
3. Department of Molecular Medicine and ImmunologyRoswell Park Memorial InstituteBuffaloNew York14263USA