1. Division of Clinical Immunology and Rheumatology, University of Alabama at Birmingham, 510 20th Street South, Faculty Office Tower 820D, Birmingham, AL 35294, USA
2. Rheumatology Unit, University of Verona, Pz Scuro 10, Verona 37135, Italy
3. Division of Clinical Immunology and Rheumatology, University of Alabama at Birmingham, Birmingham, AL, USA