[1] Univ Western Ontario, London, ON N6A 3K7, Canada
[2] Univ Michigan, Ann Arbor, MI 48109 USA
[3] Univ Med Ctr Nijmegen, Nijmegen, Netherlands
[4] Univ Toronto, Mt Sinai Hosp, Toronto Western Hosp, Toronto Scleroderma Program, Toronto, ON M5G 1X5, Canada
[5] McGill Univ, Montreal, PQ, Canada
[6] McGill Univ, Jewish Gen Hosp, Montreal, PQ H3T 1E2, Canada
[7] Univ Basel Hosp, CH-4031 Basel, Switzerland
[8] Felix Platter Hosp, Basel, Switzerland
[9] Inst Clin, Florence, Italy
[10] Natl Womens Hosp, Auckland, New Zealand