title: Authors' reply.
authors.forename: Marieke
authors.initials: M
authors.lastname: Michielsen
authors.forename: Evert
authors.initials: E
authors.lastname: Semeijn
authors.forename: Hannie
authors.initials: H
authors.lastname: Comijs
authors.forename: Aartjan
authors.initials: A
authors.lastname: Beekman
authors.forename: Sandra
authors.initials: S
authors.lastname: Kooij
mesh_terms: D000375:Aging / Q000523:psychology*; D001289:Attention Deficit Disorder with Hyperactivity / Q000453:epidemiology*; D005260:Female; D006801:Humans; D008297:Male