1F. Lefebvre, MD, MSc, Vasculitis Clinic, Division of Rheumatology, Department of Medicine, Centre Hospitalier de l’Université de Montréal (CHUM), Université de Montréal, Montreal, Quebec, and Vasculitis Clinic, Mount Sinai Hospital, Department of Medicine, Division of Rheumatology, University Health Network, University of Toronto, Toronto, Ontario;