TY - RPRT TI - External quality assessment of prothrombin time: the split-sample model compared with external quality assessment with commercial control material. AU - U Ø Sølvik AU - A Stavelin AU - N G Christensen AU - S Sandberg PY - 2006 DO - 10.1080/00365510600684580 UR - https://pubmed.ncbi.nlm.nih.gov/16777762/ ID - 16777762 ER -