1. Connective Tissue Diseases Unit, Department of Internal Medicine, University Hospital of Salamanca-IBSAL, 37001 Salamanca, Spain
2. Department of Medicine, Faculty of Medicine, University of Salamanca, 37001 Salamanca, Spain
3. Department of Radiology, University Hospital of Salamanca-IBSAL, 37001 Salamanca, Spain
4. Department of Hematology, University Hospital of Salamanca-IBSAL, 37001 Salamanca, Spain