[1] Univ Penn, Philadelphia, PA 19104 USA
[2] Bristol Myers Squibb Co, Wallingford, CT 06492 USA
[3] Yale Univ, New Haven, CT USA
[4] Univ Toronto, Toronto, ON, Canada
[5] Univ S Florida, Tampa, FL USA
[6] Cleveland Clin Fdn, Ctr Vasculitis Care & Res, Cleveland, OH 44195 USA
[7] McMaster Univ, St Josephs Hosp, Hamilton, ON, Canada
[8] Cleveland Clin, Ctr Vasculitis Care & Res, Cleveland, OH 44106 USA
[9] Univ Penn, Vasculitis Ctr, Philadelphia, PA 19104 USA
[10] Boston Univ, Boston, MA 02215 USA
[11] Johns Hopkins Univ, Johns Hopkins Vasculitis Ctr, Baltimore, MD USA
[12] Mayo Clin, Rochester, MN USA
[13] Univ Penn, Div Rheumatol, Vasculitis Ctr, Philadelphia, PA 19104 USA
[14] Yale Univ, Sch Med, New Haven, CT USA