[1] Formerly Trainee in Rheumatology, Section of Rheumatology, Hahnemann Medical College, Philadelphia, Pennsylvania
[2] Department of Medicine, University of Chicago, Illinois 60637, Chicago, Illinois, 60637
[3] General Clinical Research Center, Philadelphia General Hospital, School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
[4] Division of Experimental Pathology, Children's Hospital of Philadelphia, School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
[5] Section of Rheumatology, Hahnemann Medical College, Philadelphia, Pennsylvania