RT Journal Article SR Electronic T1 Photodynamic treatment of pooled coumarin plasma for external quality assessment of the prothrombin time. JF Journal of Clinical Pathology JO J Clin Pathol FD BMJ Publishing Group Ltd and Association of Clinical Pathologists SP 646 OP 646 VO 53 IS 8 YR 2000 UL http://jcp.bmj.com/content/53/8/646.2.abstract AB