1. Division of Rheumatology and Clinical Immunology, Department of Medicine, University of Pittsburgh, Pittsburgh, PA 15261, USA.
2. Department of Biological Sciences, University of Pittsburgh, Pittsburgh, PA 15261, USA.
3. Department of Dermatology, Taubman Center, University of Michigan, Ann Arbor, MI 48109, USA.
4. Division of Allergy and Immunology, University of Michigan, Ann Arbor, MI 48109, USA.