1. Department of Medicine and Research Laboratory of Internal Medicine, School of Medicine, University of Thessaly, Larissa, Greece,
2. Department of Pathophysiology, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece,
3. Department of Molecular Medicine, Hellenic Pasteur Institute, Athens, Greece, and
4. Joint Academic Rheumatology Program, National and Kapodistrian University of Athens, Athens, Greece