1. Division of Rheumatology and Clinical Immunology, University of Pittsburgh, Pittsburgh, PA, USA.
2. Diabetes Unit, Massachusetts General Hospital, Boston, MA, USA.
3. Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, NC, USA.
4. Department of Medicine, Duke University Medical Center, Durham, NC, USA.
5. Division of Pediatrics, University of Pittsburgh, Pittsburgh, PA, USA.
6. Department of Immunology, University of Pittsburgh, Pittsburgh, PA, USA.