title: Validity of reaction index and positivity ratio?
authors.forename: Klaus Ejner
authors.initials: KE
authors.lastname: Andersen
authors.forename: Flemming
authors.initials: F
authors.lastname: Andersen
mesh_terms: D017449:Dermatitis, Allergic Contact / Q000175:diagnosis*; D005189:False Positive Reactions; D006801:Humans; D010328:Patch Tests / Q000379:methods / Q000592:standards*; D015203:Reproducibility of Results; D013223:Statistics as Topic