title: Is there a need for replacement of the International Reference Preparation for Thromboplastin, Bovine, Combined (OBT/79)?
authors.forename: A M H P
authors.initials: AM
authors.lastname: van den Besselaar
authors.forename: A
authors.initials: A
authors.lastname: Tripodi
mesh_terms: D000818:Animals; D002138:Calibration; D002417:Cattle; D007391:International Cooperation; D019934:International Normalized Ratio; D012015:Reference Standards; D013925:Thromboplastin / Q000592:standards*
chemical_list: D013925:Thromboplastin