title: Comments on 'Practical experiences on the necessity of external validation'.
authors.forename: Jonas
authors.initials: J
authors.lastname: Björk
authors.forename: Michael
authors.initials: M
authors.lastname: Green
authors.forename: Ulf
authors.initials: U
authors.lastname: Ekelund
mesh_terms: D002545:Brain Ischemia / Q000401:mortality / Q000534:rehabilitation*; D016001:Confidence Intervals; D003663:Decision Trees; D015340:Epidemiologic Research Design; D005858:Germany / Q000453:epidemiology; D006801:Humans; D016015:Logistic Models; D015337:Multicenter Studies as Topic / Q000379:methods; D011379:Prognosis; D020127:Recovery of Function; D054928:Validation Studies as Topic