1. Department of Radiology, Stanford University School of Medicine, 300 Pasteur Dr, Stanford, CA 94305.
2. Radiology and Imaging Sciences, NIH Clinical Center, Bethesda, MD.
3. Department of Medicine, Immunology and Rheumatology Division, Stanford University School of Medicine, Stanford, CA.
4. Department of Medicine, Palo Alto VA Health Care System, Palo Alto, CA.
5. Department of Dermatology, Stanford University School of Medicine, Stanford, CA.