A prospective cohort study determining the prevalence of thrombotic events in children with acute lym-phoblastic leukemia and a central venous line who are treated with L-asparaginase: results of the Prophylactic Antithrombin Replacement in Kids with Acute Lymphoblastic Leukemia Treated with Asparaginase (PARKAA) Study - Mitchell, LG; Andrew, M; Hanna, K (Cancer, 2003)