1. Department of internal medicine, Division of rheumatology and Michigan Scleroderma Program, University of Michigan, Ann Arbor, Michigan, USA
2. Division of Rheumatology, Department of Internal Medicine, University of Michigan, Ann Arbor, Michigan, USA
3. Department of internal medicine, Univ Rennes, CHU Rennes, Inserm, EHESP, Irset (Institut De Recherche En Santé, Environnement Et Travail) - UMR_S 1085, Rennes, France
4. Department of Internal Medicine and Clinical Immunology, Rennes University Hospital, Rennes, France
5. Department of Experimental and Clinical Medicine, Division of Rheumatology, University of Florence, Florence, Italy