1. Department of Rheumatology and Immunology, Medical School, University of Pécs, Pécs
2. Department of Health Economics, Corvinus University of Budapest, Budapest, Hungary
3. Department of Rheumatology, David Geffen School of Medicine, UCLA, Los Angeles, CA, USA
4. Internal Medicine and Rheumatology, Carol Davila University of Medicine and Pharmacy, Bucharest, Romania
5. Department of Medicine, University of Michigan Scleroderma Program, University of Michigan, Ann Arbor, MI, USA