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Studien omnämns som en kohortstudie. I den fullständiga artikeln presenteras även resultat avseende barnens mobiltelefonanvändning vid 7 års ålder och förekomst av huvudvärk vid samma ålder. Analyser avseende mobiltelefonanvändning vid 7 års ålder ("postnatal exposure") och huvudvärk vid denna ålder är inte en kohortstudie utan en annan typ av studie. Vad kallas denna typ av studie?
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