ADAMTS13 activity in thrombotic thrombocytopenic purpura-hemolytic uremic syndrome: relation to presenting features and clinical outcomes in a prospective cohort of 142 patients. Blood. 2003 Jul 1;102(1):60-8. Epub 2003 Mar 13.
Prospective study of 255 patients (w/no family history of TTP or HUS) diagnosed with TTP-HUS in 11 hospitals in one region of the US