1. Division of Rheumatology Allergy and Immunology, Department of Medicine and The Sam and Rose Stein Institute for Research on Aging, University of California, San Diego, La Jolla, CA 81534
2. Division of Hematology/Oncology, Department of Medicine and The Sam and Rose Stein Institute for Research on Aging, University of California, San Diego, La Jolla, CA 81534
3. Division of Rheumatology Allergy and Immunology, Department of Medicine and The Sam and Rose Stein Institute for Research on Aging, University of California, San Diego, La Jolla, CA 81534; and Rheumatologische Klinik, Universitaetsspital Zuerich, 8091 Zurich, Switzerland