Browsing Institutt for helse og samfunn by Author "Johanne Søgaard, Anne"
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Bjertness, Espen; Sagatun, Åse; Green, Kristian; Lien, Lars; Johanne Søgaard, Anne; Selmer, Randi (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2010)Background Selection bias is a threat to the internal validity of epidemiological studies. In light of a growing number of studies which aim to provide DNA, as well as a considerable number of invitees who ...