1. Department of Laboratory Medicine, Warren Grant Magnuson Clinical Center, Bethesda, MD;
2. ALPS Unit, Laboratory of Clinical Infectious Diseases, National Institute of Allergy and Infectious Diseases, Bethesda, MD;
3. Division of Pediatric Rheumatology, Tufts University School of Medicine, Boston, MA; and
4. Laboratory of Pathology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD