Interlaboratory Variation in Factor VIII:C Inhibitor Assay Results Is Sufficient to Influence Patient Management: Data from the UK National Quality External Assessment Scheme for Blood Coagulation - Kitchen, Steve; Jennings, Ian; Preston, F. Eric; Kitchen, Dianne P; Woods, Tim A. L; Walker, Isobel D (Seminars in Thrombosis and Hemostasis, 2009)