[1] Univ Western Ontario, Schulich Sch Med & Dent, Dept Med, London, ON, Canada
[2] St Josephs Hlth Care, Div Rheumatol, London, ON, Canada
[3] Johns Hopkins Univ, Johns Hopkins Scleroderma Ctr, Div Rheumatol, Sch Med, Baltimore, MD USA
[4] Univ Pittsburgh, Div Rheumatol & Clin Immunol, Sch Med, 3500 Terrace St, Pittsburgh, PA 15261 USA