1 Department of Pediatrics, Division of Allergy, Immunology and Rheumatology, University of California Davis, School of Medicine, Sacramento, Calif. Electronic address: aphnguyen@ucdavis.edu.
2 Alameda Centre Physicians, Alameda, Calif; Department of Internal Medicine, Division of Rheumatology, Allergy and Clinical Immunology, University of California Davis, School of Medicine, Sacramento, Calif.
3 Department of Internal Medicine, Division of Rheumatology, Allergy and Clinical Immunology, University of California Davis, School of Medicine, Sacramento, Calif; Veterans Affairs Northern California Healthcare System, Mather, Calif.