Matthieu Groh1, Christian Pagnoux2, Loïc Guillevin3. 1. Dept of Internal Medicine, National Referral Center for Rare Autoimmune and Systemic Diseases (Vasculitis, Scleroderma), Hôpital Cochin, APHP, Université Paris Descartes, Paris, France matthieu.groh@cch.aphp.fr. 2. Division of Rheumatology, Dept of Medicine, Mount Sinai Hospital, University of Toronto, Toronto, ON, Canada. 3. Dept of Internal Medicine, National Referral Center for Rare Autoimmune and Systemic Diseases (Vasculitis, Scleroderma), Hôpital Cochin, APHP, Université Paris Descartes, Paris, France.