[1] McGill Univ, Jewish Gen Hosp, Ctr Clin Epidemiol & Community Studies, Lady Davis Inst, Montreal, PQ H3T 1E2, Canada
[2] Ottawa Hosp, Div Hematol, Ottawa, ON, Canada
[3] Ottawa Hosp, Res Inst, Ottawa, ON, Canada
[4] Univ Western Ontario, Dept Hematol, London Hlth Sci Ctr, London, ON, Canada
[5] Queen Elizabeth 2 Hlth Sci Ctr, Thrombosis Unit, Halifax, NS, Canada
[6] Univ Montreal, Montreal, PQ, Canada
[7] McGill Univ, Jewish Gen Hosp, Ctr Clin Epidemiol, Montreal, PQ H3T 1E2, Canada
[8] Montreal Gen Hosp, Montreal, PQ H3G 1A4, Canada
[9] St Marys Hosp, Montreal, PQ, Canada
[10] Hop Notre Dame de Bon Secours, Ctr Hosp Univ Montreal, Montreal, PQ H2L 4K8, Canada
[11] Toronto Gen Hosp, Hamilton, ON, Canada
[12] Maisonneuve Rosemont Hosp, Montreal, PQ, Canada
[13] Henderson Gen Hosp, McMaster Univ Clin, Hamilton, ON, Canada
[14] Hop Sacre Coeur, Montreal, PQ H4J 1C5, Canada
[15] St Boniface Gen HospitalManitoba, Winnipeg, MB, Canada
[16] Hop Enfants Jesus, Quebec City, PQ, Canada
[17] Henry Ford Hosp, Detroit, MI 48202 USA
[18] Sunnybrook & Womens Hosp, Toronto, ON, Canada
[19] Univ Oklahoma, Hlth Sci Ctr, Norman, OK 73019 USA
[20] Ctr Hosp Pierre Boucher, Longueuil, PQ, Canada
[21] Duke Univ, Med Ctr, Durham, NC 27706 USA
[22] McMaster Univ, Med Ctr, Dept Med, Hamilton, ON L8N 3Z5, Canada