1. Division
of Rheumatology, Johns Hopkins University School of Medicine, Baltimore, Maryland 21224, United States
2. Department
of Pathology, Johns Hopkins University School of Medicine, Baltimore Maryland 21205, United States
3. Department
of Molecular Therapeutics, The Scripps Research Institute, Jupiter, Florida 33458, United States
4. Department
of Biological Chemistry, Mass Spectrometry and Proteomics Facility, Johns Hopkins University School of Medicine, Baltimore Maryland 21205, United States
5. Division
of Rheumatology, Columbia University, College of Physicians and Surgeons, New
York, New York 10027, United States