title: The combined-target approach: a way out of the proficiency testing dilemma.
authors.forename: D
authors.initials: D
authors.lastname: Stöckl
authors.forename: L M
authors.initials: LM
authors.lastname: Thienpont
mesh_terms: D019411:Clinical Laboratory Techniques / Q000592:standards*; D010336:Pathology / Q000379:methods*; D011785:Quality Assurance, Health Care