[1] Univ Hlth Network, Toronto, ON, Canada
[2] Toronto Western Hosp, Toronto, ON M5T 2S8, Canada
[3] McMaster Univ, Hamilton, ON, Canada
[4] Univ S Florida, Tampa, FL USA
[5] Univ Toronto, Toronto, ON, Canada
[6] Cleveland Clin Found A50, Cleveland, OH USA
[7] Cleveland Clin, Cleveland, OH 44106 USA
[8] Boston Univ, Sch Med, Boston, MA 02118 USA
[9] Hop Cochin, F-75674 Paris, France
[10] Johns Hopkins Vasculitis Ctr, Baltimore, MD USA
[11] Mayo Clin, Rochester, MN USA
[12] Cochin Univ Hosp, Paris, France