Johnson, S.
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Univ Toronto, Toronto Western Hosp, Dept Med, Toronto Scleroderma Program, Toronto, ON, Canada
Univ Toronto, Mt Sinai Hosp, Dept Med, Toronto Scleroderma Program, Toronto, ON, Canada Univ Calif Los Angeles, David Geffen Sch Med, Dept Med, Div Rheumatol, Los Angeles, CA 90095 USA