[1] Univ Toronto, Toronto, ON, Canada
[2] Univ Paris 05, Hop Cochin, Paris, France
[3] McMaster Univ, Hamilton, ON, Canada
[4] Univ S Florida, Tampa, FL USA
[5] Ctr Vasculitis Care & Res, Cleveland, OH USA
[6] Johns Hopkins Vasculitis Ctr, Baltimore, MD USA
[7] Mayo Clin, Rochester, NY USA
[8] Boston Univ, Vasculitis Ctr, Boston, MA 02215 USA