1. Department of Internal Medicine. Hôpital Erasme Brussels Belgium
2. Department of Nephrology Hôpital de la Conception Marseille France
3. French Vasculitis Study Group Paris France
4. Department of Nephrology Hôpital Erasme Brussels Belgium
5. Department of Internal Medicine National Referral Center for Rare Systemic Autoimmune Diseases. Hôpital Cochin Paris France