title: Pitfalls in the external validation of FRAX: response to Bolland et al.
authors.affiliation: WHO Collaborating Centre for Metabolic Bone Diseases, University of Sheffield Medical School, Beech Hill Road, Sheffield, S10 2RX, UK, w.j.pontefract@sheffield.ac.uk.
authors.forename: J A
authors.initials: JA
authors.lastname: Kanis
authors.forename: A
authors.initials: A
authors.lastname: Oden
authors.forename: H
authors.initials: H
authors.lastname: Johansson
authors.forename: E
authors.initials: E
authors.lastname: McCloskey
mesh_terms: D006801:Humans; D058866:Osteoporotic Fractures / Q000209:etiology*; D018570:Risk Assessment / Q000379:methods*