1. INSERM U475, and Université Montpellier I, 34197 Montpellier, France.
2. Division of Clinical Immunology and Rheumatology, AMC, University of Amsterdam, 1105 AZ Amsterdam, The Netherlands.
3. Genethon III, CNRS UMR 8115, 91000 Evry, France.
4. Service d'Immuno-rhumatologie, CHU Lapeyronie, 34295 Montpellier, France.