title: Issues of QCA validation.
authors.forename: P M
authors.initials: PM
authors.lastname: van der Zwet
authors.forename: J H
authors.initials: JH
authors.lastname: Reiber
mesh_terms: D017023:Coronary Angiography; D006801:Humans; D015588:Observer Variation; D011857:Radiographic Image Interpretation, Computer-Assisted; D015203:Reproducibility of Results