1. Department of Rheumatology; School of Medicine; University of California, San Diego; La Jolla CA USA
2. Department of Pathology; School of Medicine; University of California, San Diego; La Jolla CA USA
3. Department of Radiology; School of Medicine; University of California, San Diego; La Jolla CA USA
4. Department of Dermatology; School of Medicine; University of California, San Diego; La Jolla CA USA
5. Department of Pathology; University of Iowa; Iowa City IA USA