title: [Risk or advantage with repeated tests?].
authors.forename: A
authors.initials: A
authors.lastname: Helander
mesh_terms: D019411:Clinical Laboratory Techniques / Q000592:standards*; D005188:False Negative Reactions; D005189:False Positive Reactions; D006801:Humans; D012016:Reference Values; D015203:Reproducibility of Results; D012307:Risk Factors