title: [Is usually more often than frequently, or how often is sometimes?].
authors.forename: P L
authors.initials: PL
authors.lastname: Kerkhof
authors.forename: H G
authors.initials: HG
authors.lastname: de Bruin
authors.forename: R
authors.initials: R
authors.lastname: Koenen
authors.forename: K
authors.initials: K
authors.lastname: Gill
mesh_terms: D003142:Communication; D006801:Humans; D007802:Language; D012660:Semantics; D013223:Statistics as Topic
vernacular_title: Is doorgaans vaker dan dikwijls; of hoe vaak is soms?