title: Executive summary? All about validating scales and stages.
authors.forename: Isolde
authors.initials: I
authors.lastname: den Tonkelaar
authors.forename: Frank J
authors.initials: FJ
authors.lastname: Broekmans
authors.forename: Evelien J
authors.initials: EJ
authors.lastname: de Boer
authors.forename: Egbert R
authors.initials: ER
authors.lastname: te Velde
mesh_terms: D000375:Aging / Q000502:physiology*; D005260:Female; D006801:Humans; D015203:Reproducibility of Results; D018456:Reproductive Medicine / Q000379:methods*; D012727:Sex Characteristics